Tamago in Japan – How the Egg Traveled from Cosmic Taboo to National Obsession

For over a thousand years, Japan refused to eat eggs — Buddhist taboos and Shinto fears of ritual impurity kept them off the table. Then came 103 recipes in 1785, raw egg on rice, and black eggs boiled in a volcano. A love story that began with fear.

A country that feared eating eggs for centuries now consumes over three hundred per person per year.

For over a thousand years, Japan regarded the egg with suspicion. Emperor Tenmu’s edict of 675 prohibited the eating of chickens, and though it never mentioned eggs by name, Buddhist logic closed the loophole on its own: an egg smelled of life that might yet be born, so it was best left untouched. In medieval tale collections, people were punished for killing animals with boils, fire, and boiling in oil – the egg sat in the shadow of those stories, formally legal yet surrounded by dread. Shintō added its own layer – the concept of ritual defilement meant that anything hovering on the boundary between life and non-life was suspect. And the egg hovered.

Then the Edo era arrived, and everything changed. In 1785, a cookbook appeared featuring a section called “Tamago Hyakuchin” – one hundred and three recipes for eggs, from boiling in sake to baking inside bamboo tubes. A bestseller. Around the same time, in Ōji, a restaurant called Ōgiya had been operating since 1648 (and remains open today), immortalized by Hiroshige in a woodblock print – its signature dish was the golden, multi-layered omelet tamagoyaki (卵焼き), food for the townspeople who were the first to swallow their Buddhist scruples, and right after that – the egg. The Meiji era opened the gates wider: in 1877, journalist Kishida Ginkō began publicly praising raw egg on hot rice, and in 1891, at the Tamahide restaurant in Tokyo, oyakodon (親子丼) was born – the “parent-and-child bowl,” chicken and egg simmered together over rice, a dish whose name may raise certain ethical reservations, but has amused the Japanese for a hundred and thirty years.

And today? Japan consumes over three hundred eggs per person per year – one a day for every inhabitant of the islands, from infants to centenarians in Okinawa. “TKG” means raw egg on rice. There exists a TKG Research Institute investigating sixteen official ways of eating TKG (including a style called “Flying Nimbus” – because the whipped egg white looks like Goku’s cloud). There is TKG Day, October 30th. There is a small town called Misaki-chō, to which seventy thousand people make a pilgrimage every year for a bowl of rice with raw egg. There is a Guinness record – three hundred and twenty-five people preparing tamago kake gohan (卵かけご飯, TKG) simultaneously. And there are black eggs boiled in a volcano in Hakone, 500 yen for four, with the promise of seven extra years of life. The country that for centuries feared eating eggs came to love them the way it loves everything it truly decides to love – without moderation, without compromise, with research institutes, world records, and decades of culinary training to master the perfect omelet. Today, during the Easter season, I invite you to discover the strange history of Japan’s aversion to and love affair with the egg.

The Cosmic Egg

Japan’s oldest state document is the Nihon Shoki (日本書紀), a chronicle completed in 720. And its opening passage begins with an egg. Literally. Before the gods appeared, before heaven separated from earth, there was chaos – and that chaos was “like a hen’s egg.” The original text reads: “渾沌如鶏子” (konton keishi no gotoshi – lit. “a state of chaos like a hen’s egg”) – the primordial substance of the universe, undivided, embryonic, full of potency. Japanese cosmogony does not begin with an explosion, a word, or an act of will – it begins with an egg.

This was no accident. The cosmic egg motif runs through the mythologies of half the world – the Hindu Brahma meditates inside a golden egg, the Chinese Pangu shatters the shell of a cosmic egg, and even in the Hebrew original of the Book of Genesis, the words about God’s spirit “hoving over the waters” are read by some Hebraists as “brooding over an egg above the primordial ocean.” But the Japanese version has its own distinctive quality: the egg is not a vessel for a deity, but a state of pre-beginning. It is that which has not yet decided what it will become. The yolk will become heaven (light, pure), the white will become earth (heavy, turbid) – but in the egg state, nothing is yet determined.

The chicken, too, was no coincidence. In the myth of Ama no Iwato (天岩戸) – when the sun goddess Amaterasu shut herself inside a cave and the world plunged into darkness (Goddess Uzume dances naked and, with her sacred antics, saves us from sorrowful seriousness – Japanese mythology, how timely today) – it was the roosters (“long-crying birds”) that formed the crucial link in the ritual that lured her out. To this day, the Grand Shrine of Ise, Shintō’s most sacred site, keeps sacred roosters – shinkei (神鶏). The bird that restores light. The bird that laid eggs of cosmic order. To eat such an egg – that was not a question of calories. It was a question of cosmology.

This is worth appreciating: Japanese mythology does not begin with an act of creation, but with a state of readiness. The egg was not cracked open by any god – it divided on its own when the time came. This is deeply Japanese: not action, but ripening. Not will, but process.

The Ban That Never Was a Ban

In 675, Emperor Tenmu issued an edict known as sessō kinshi (殺生禁止, lit. “prohibition on killing living beings”) – a ban on killing five animals: cattle, horses, dogs, monkeys, and chickens. The ban applied from April to September, the period of intensive agricultural work, and had clearly Buddhist roots – the school of dharma tied to the state apparatus required an official gesture of humility toward life. But here is the curious thing: eating eggs was never explicitly prohibited. No imperial document says: “do not eat eggs.”

And yet the Japanese did not eat them. Why? Because an egg was something worse than meat – it was meat that did not yet know it was alive. Buddhist logic operated here more subtly than any edict: if killing is a sin, then what about eating something that might yet be born? The concept of inga ōhō (因果応報, lit. “cause and fruit, response and retribution”) – karmic responsibility for one’s actions – meant that people feared not so much the ban itself as the consequences. Medieval tale collections such as the Nihon Ryōiki (日本霊異記) are teeming with examples of people punished for killing animals: a man who skinned a hare alive died covered in festering sores; a merchant who beat horses to death boiled alive in his own cauldron. The egg sat in the shadow of these tales – formally permitted, but surrounded by fear.

On top of this came the Shintō concept of kegare (汚れ, lit. “defilement”) – ritual impurity associated with blood, birth, and death. The egg, as a threshold between non-life and life, carried the scent of that impurity. A paradox: fish were permitted, because the sea was a separate world, further from human spheres. But the chicken lived in the yard, shared space with people, and its egg lay within arm’s reach. The closer, the more suspicious.

A Hundred Ways with an Egg

And then the Edo era arrived, and practice began. Gradually, from the seventeenth century onward, eggs started appearing on tables – first as a luxury, then as an attraction. Itinerant vendors sold them on the streets of Edo, though prices remained high. And in 1785, something unprecedented occurred: a cookbook was published titled “Manpō Ryōri Himitsubako” (万宝料理秘密箱, “The Secret Chest of Countless Culinary Treasures”), and within it – a section called “Tamago Hyakuchin” – “A Hundred Egg Rarities.” One hundred and three recipes. For a single ingredient. In a country that had only recently preferred not to touch it.

This was no random collection of kitchen notes. “Tamago Hyakuchin” belonged to a fashionable genre known as hyakuchin-mono (百珍物) – a series of “a hundred ways with X” that served as intellectual entertainment in the Edo period. The trend was launched by a bestselling tofu book in 1782 (“Tōfu Hyakuchin”), followed by books on sea bream, on yuzu, dish after dish. The author was the mysterious Kidodō (器土堂) – a pen name that likely concealed a professional cook, judging by the precision of his descriptions of temperature and proportions. The book was not intended for professionals – its publisher’s advertisement praised it as “a wonderful gift” and “entertainment for refined people.” Cooking became a game, and the egg – its favorite piece.

The recipes were astonishingly inventive: eggs boiled in sake, eggs shaped like chrysanthemums, eggs dyed yellow and arranged like flowers. The instructions even specified which vessel to serve each dish on and for what occasion. The egg became an element of culinary aesthetics – a burst of color in the world of browns and whites that defined Japanese cuisine. One ingredient, a hundred variations, each with instructions for plating. In the West, people were writing treatises on sugar at the same time. Japan was writing poems about the egg.

Each recipe was categorized: from “common” through “refined” to “extraordinary.” Some required cooking eggs inside bamboo tubes, others called for wrapping them in paper and baking them over embers. One dish involved boiling twenty eggs in sake, then tossing live dojo – small freshwater fish – into the bowl, where they would burrow into the egg to escape the heat, creating a complex texture once steamed. The whole thing was served in a bowl of misoshiru. It is hard to say whether this was cooking, alchemy, or performance – but it was certainly not boring.

The Golden Birth of Tamagoyaki

Before “Tamago Hyakuchin” hit the shelves, the egg already had its established place in Edo cuisine under the name tamago fuwafuwa (卵ふわふわ, lit. “fluffy egg”). It was a kind of delicate egg foam steamed in a broth of seaweed and katsuobushi flakes. The dish was so popular that it appears in “Tōkaidō-chū Hizakurige” – the Edo era’s comedic bestseller about two rogues’ journey along the Tōkaidō road – as the specialty of the Fukuroi post station (Yaji and Kita on the Tōkaidō Road – Samurai-Era Japan Through the Eyes of Two City Rogues in Trouble on the Countryside).

But the true star became tamagoyaki (卵焼き, lit. “fried egg”) – a sweetish, multi-layered omelet rolled on a special rectangular pan. In the Ōji district, known for its cherry gardens and teahouses, there stood the restaurant Ōgiya (扇屋) – open since 1648 and still operating today. Hiroshige immortalized it in his series “Edo Kōmei Kaitei Zukushi” (江戸高名会亭尽) – woodblock prints depicting the most famous restaurants of Edo – and its specialty was none other than tamagoyaki. This omelet was the food of townspeople – chōnin, merchants and artisans, who were the first to swallow their Buddhist scruples and begin eating eggs without shame.

In that world, sugar was a luxury commodity – so sweet tamagoyaki was a declaration of status: I can afford sugar, I can afford eggs, I can afford the time to prepare this beautifully. The golden glow of the omelet amidst the grays and browns of the Japanese table was like a small sun. And like every sun – it brought joy.

Parent and Child in One Bowl

The Meiji era (from 1868) brought an opening to the West, and with it – to meat and eggs without lingering guilt. The egg strode onto the Japanese table with force: as an ingredient of modernity, health, progress. And it immediately demonstrated what Japanese linguistic sensibility truly is – because no other cuisine in the world would name a dish the way Japan named its most popular egg creation.

Oyakodon (親子丼). Literally: “parent-and-child bowl.” Chicken and egg simmered together in a sweet-salty sauce over rice. Mother and offspring in a single vessel. The name, I confess, raises certain reservations… The Japanese apparently see in this not cruelty but poetry: the bond between the ingredients is so intimate that the dish acquires a soul. Tradition attributes the invention of oyakodon to the Tamahide restaurant in Tokyo’s Ningyōchō district, in the year 1891: a guest reportedly took leftover chicken from a nabemono hot pot, spread it over rice, poured beaten egg on top, and thus created one of Japan’s most important comfort foods.

Japanese cuisine adores wordplay in the names of its dishes, wielding them like little philosophical jokes. If you replace the chicken with beef or pork, you get tanindon (他人丼) – the “stranger’s bowl.” Because the meat and the egg are not related. And if you place salmon with salmon roe over rice – it becomes oyakodon (親子丼) once again, but in a maritime version, from Miyagi Prefecture, where they call it harako meshi (はらこ飯, lit. “rice with children from the belly”). In every case, naming the food is an act of narration – the dish has a story before it reaches your mouth.

But beyond the humor of naming, Japan created from the egg an entire branch of cuisine for which Europe has no real equivalent. Chawanmushi (茶碗蒸し) – a cup of egg cream steamed with shrimp, ginkgo, and shiitake mushrooms, served as a course in every kaiseki (懐石, the traditional multi-course feast). The consistency is so delicate that the egg barely exists – it is a warm, silken presence rather than a structure. Then there is onsen tamago (温泉卵) – an egg cooked in a hot spring, slowly, at around 65–70°C – so that the white remains semi-liquid while the yolk turns creamy: a consistency somewhere between liquid and dream. The name does not lie – this is truly a product of hot springs, temperature, and patience.

And there is one more thing that says more about Japan’s relationship with the egg than any recipe: price. Eggs in Japan are among the few food products whose price has barely changed since the 1970s. While fruits, vegetables, and fish have risen in cost by an average of three and a half times, a pack of ten eggs costs 200 yen at the supermarket (around €1.30), and in some regions as little as 100 yen. This is a systemic principle: the egg must be accessible to everyone. In a country where a melon can cost ten thousand yen (Yūbari – the City That Teaches How to Die Slowly – A Vision of the Future for Japan, Poland, and the World?), the egg is democratic.

The Raw Egg and the Religion of Trust

There is one dish that defines Japan’s relationship with the egg better than any other. Tamago kake gohan (卵かけご飯, lit. “rice splashed with egg”), abbreviated TKG. You will see this abbreviation everywhere in Japan – on restaurant menus, in the media, on sauce packaging; there are TKG festivals, TKG Day, even a TKG Research Institute. TKG is a raw egg cracked onto hot, steaming rice, drizzled with soy sauce, and mixed with chopsticks to a creamy consistency. Three ingredients. Zero cooking. Complete flavor. For a Japanese person – the perfect breakfast. For most of the planet’s inhabitants – madness.

The first documented champion of TKG was Kishida Ginkō – a pioneer of Japanese journalism and the country’s first war correspondent – who around 1877 began publicly praising egg on rice, seasoned with salt and pepper. Those were the days of the Meiji era, when eggs were still expensive. It was only after the Second World War, in the 1950s, when poultry farming became industrialized and eggs dropped to become one of the cheapest products on Japanese shelves – ten eggs for 200 yen – that TKG became a national institution.

But for an egg to be eaten raw, someone had to ensure it would be safe. And here begins a story that says as much about Japan as it does about the egg. Japan’s egg quality control system is one of the most rigorous in the world: farms undergo strict sanitary audits, eggs are washed and disinfected with hypochlorite solution, each one is stamped with its laying date, and the entire packaging chain is automated so that no human hand touches the shell. The result: salmonella in Japan is so rare that cases are counted in the dozens annually – in a country of one hundred and twenty-seven million people (in much smaller Poland, the figure was nearly 10,000 cases in 2024, the majority traced to chicken eggs). A raw egg in Japan is not an act of bravado. It is an act of trust – in the system, in the producer, in the chain that works.

An entire world has grown up around TKG: special soy sauces (sweeter, with dashi, with mirin), designed exclusively for raw egg on rice. The first such sauce, Otamahan, was created in 2002 in Shimane Prefecture and sparked a wave of imitators. There is TKG Day (October 30th), there are festivals, there is the TKG Research Institute founded by chef Takafumi Ueno, and there are sixteen official styles of eating – from “Falling Star” (mix the egg with sauce, place on rice) to “Flying Nimbus” (whip the white into foam, place on rice, embed the yolk in the center – if you know Dragon Ball, you understand the name). Japan also loves to add a raw egg as a dip for sukiyaki – hot meat dipped in cold, raw egg. A contrast of temperatures, textures, and culinary logics – all in a single gesture.

The birthplace of TKG is the small town of Misaki-chō in Okayama Prefecture – the hometown of Kishida Ginkō. Today, Misaki-chō is something like a Compostela for lovers of egg on rice: around seventy thousand people visit each year to eat TKG made with local eggs and local sauce. There is a restaurant called Shokudō Kamecchi, which serves exclusively rice with raw egg – and has a permanent queue at the door. In August 2024, in the town of Pippu on Hokkaidō, a Guinness record was set: three hundred and twenty-five people prepared tamago kake gohan simultaneously. The idea came from local middle school students (or their teachers and a related business venture – let’s not be that naïve). They wanted to promote local rice, local eggs, and local soy sauce. It worked.

The Master’s Test – Tamago Sushi

In the world of sushi, there is an unwritten rule: if you want to know how good the chef is, order tamago. Not otoro, not uni, not ikura. Egg. Because behind a luxury ingredient, you can hide – a slice of fresh tuna does half the work on its own. But tamagoyaki is a genuine examination: heat control, rolling precision, the balance of sweetness and umami, a silky consistency without air bubbles, a golden color without a single brown spot. There is nowhere to hide.

The legendary Jiro Ono – the oldest sushi chef ever awarded three Michelin stars – had an apprentice who spent ten years trying to bring his tamagoyaki to perfection before the master nodded his approval. Ten years. For an omelet. In traditional sushi-ya, tamagoyaki is served at the end of an omakase tasting – as the quiet finale after a symphony of fish. It is not a dessert. It is the chef’s signature. A calling card made of egg.

Surprising regional differences exist. In Kantō, atsuyaki tamago (厚焼き卵) dominates – a thicker and sweeter version, almost like a noble cake. In Kansai, dashimaki tamago (だし巻き卵) reigns – more delicate, with added dashi broth that makes the omelet moist and trembling, nearly liquid inside. Some masters go further still: kasutera tamago is a version made with shrimp paste and grated nagaimo, whose preparation takes over an hour. One hour for an omelet. This is not cooking. This is meditation.

At the old Tsukiji market in Tokyo – and today at Toyosu – shops specialize exclusively in tamagoyaki: Marutake (famous for its rich, sweet omelet), Yamachō (a favorite among sushi chefs for its balance of flavors), Daikichi (creamy consistency), Shōurō (elegant, square-cut, sold in department stores). Each has its own omelet philosophy. Each defends its ratio of sweetness to saltiness like a lion defending its territory. Tourists stand in line for a piece of omelet on a stick, not quite understanding why they are waiting twenty minutes. But after the first bite – they understand. Because this is not an omelet. This is an egg that someone treated with deadly seriousness.

The Black Egg from Hell

In the Ōwakudani valley in Hakone, which in the Edo period was still called “the Great Hell” – because volcanic gases billowed from the earth and nothing grew – you can buy something available nowhere else in the world. A black egg. Kuro tamago (黒玉子, more commonly 黒たまご). They are boiled in a volcanic spring at around 80°C for one hour, then steamed at 100°C for fifteen minutes. Hydrogen sulfide reacts with iron in the shell to form iron sulfide – hence the coal-black color. Inside: an ordinary hard-boiled egg. But not entirely ordinary – analysis commissioned by a television program* found that the yolk contains twenty percent more amino acids responsible for umami flavor than an egg boiled in regular water.

(* For those interested – the television program in question is Tokoro-san no Me ga Ten! (所さんの目がテン!) on Nippon Television. A popular science show hosted by Tokorō George. The analysis was commissioned from a specialized laboratory, so the data is ostensibly reliable, but this remains entertainment television, not a peer-reviewed publication.)

Legend says: one black egg extends your life by seven years. Why seven? In Ōwakudani stands a statue of Enmei Jizō-son (延命地蔵尊) – Jizō of Long Life, whose origin tradition attributes to Kōbō Daishi himself, from the Heian period. The pool where the eggs were boiled once stood right beside the statue – and people began linking the statue’s blessing with the egg from the same place. And “seven”? Because the shichifukujin (When the Gods Laugh Out Loud – Japan’s Shichifukujin, or Seven Eccentrics on the Path of Lightness and Grace) – the Seven Gods of Fortune – made seven an auspicious number in Japan. All it took was for someone, at some point, to say “seven years” – and it became tourist truth.

Black eggs are sold exclusively on-site, at 500 yen for four (around €3.50), only from the day’s production – no online sales, no shipping. They are made fresh every day, and unsold ones are processed into furikake (a rice seasoning sprinkle). The company uses eggs from young hens – smaller, more expensive, but with more intense flavor. Thousands of packs sell each day, delivered from the production site to the hilltop shop by a dedicated cable car. There is something beautifully absurd about this: a pilgrimage up a volcano for a hard-boiled egg. But the Japanese understand. Place gives food meaning – and food gives a place memory.

The place itself is a spectacle. The name Ōwakudani (大涌谷) literally means “Valley of Great Boiling” – until 1873 it bore a far less tourist-friendly name: Jigokudani, “Hell Valley.” It was hastily renamed ahead of Emperor Meiji’s visit – it being rather difficult to invite an emperor to hell. Sulfur fumes billow from the earth, stones are white with minerals, nothing grows. The landscape looks like a photograph from Io. And it is precisely there, in a basket lowered into a boiling pool, that the black egg is born – one of Japan’s most popular tourist products. Four in a paper bag, eaten at the summit, with a view of Fuji if the weather permits. If not – with a view of steam. Which in Japan is quite proper, and very much yūgen.

How Seriously Can You Take an Egg?

In the West, the egg has two great moments each year: Easter and Sunday breakfast. At Easter we paint them, roll them, hunt for them in gardens, and in chocolate form fill them with candy. A symbol of rebirth, fertility, new life – but in practice, often just decoration.

Japan took the egg and did with it what it does with everything it has truly come to love: it turned it inside out. It created from it a cosmogony, a test of character, a comfort food, a pilgrimage, a scientific subject, a festival theme, and a field for philosophical wordplay.

The Western world chose symbolism: the egg as idea. Japan chose practice: the egg as action. One hundred and three recipes in 1785. Three hundred and thirty-seven eggs per capita in 2018. A research institute dedicated to the ways of eating raw egg on rice.

When Japan decides to love something, it does not stop halfway. The egg is proof of this – just like tea, paper, wood, silence. On the surface – a banal thing. Beneath it – a bottomless well.

SOURCES

1. 器土堂, 『万宝料理秘密箱卵百珍』, 1785 (天明5年). Collection of 103 egg recipes from the Edo period. Available in digital collection: codh.rois.ac.jp/edo-cooking/tamago-hyakuchin/

2. 『日本書紀』巻第一, 神代上. State chronicle (720 CE), passage on 天地開闢 (tenchi kaibyaku) – cosmogony with the egg metaphor.

3. JBpress, 「卵、食べてもいいんだ」と気づいた日本人 – 卵料理、その多様化の秘密を探る, 2016.

4. NHKテキストビュー, 江戸時代の人気料理本『卵百珍』, 2019.

5. International Egg Commission (IEC), Global Egg Production Continues to Grow, 2021. Per capita egg consumption data.

6. World Atlas, Countries That Consume the Most Eggs, 2018; Statista, Annual consumption volume of eggs per capita in Japan 2013–2022.

7. 大涌谷くろたまご館, owakudani.com – history of black eggs; Weathernews SORA Magazine, 箱根噴火・規制解除から1年！黒たまごの秘密, 2017.

Tamago in Japan – How the Egg Traveled from Cosmic Taboo to National Obsession

A country that feared eating eggs for centuries now consumes over three hundred per person per year.

The Cosmic Egg

The Ban That Never Was a Ban

A Hundred Ways with an Egg

The Golden Birth of Tamagoyaki

Parent and Child in One Bowl

The Raw Egg and the Religion of Trust

The Master’s Test – Tamago Sushi

The Black Egg from Hell

How Seriously Can You Take an Egg?

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