Renowned for its stunning architecture, cutting‑edge technology, and deep‑rooted traditions, Japan captivates anyone who studies its culture. Yet beyond the high‑tech gadgets, eccentric game shows, and vivid anime, the nation’s culinary scene offers an equally fascinating, if not more bewildering, adventure. In this roundup of the 10 strangest Japanese foods, you’ll meet dishes that challenge the palate and the imagination alike.
Japanese gastronomy has evolved over centuries, shaped by social shifts, political changes, and economic twists. Chefs across the islands love to blend global influences with home‑grown flair, spawning a mishmash of creations that range from the merely novel to the outright bizarre. As you scroll through this list, you’ll see how the Japanese embrace the motto “try everything once,” turning even the most unlikely ingredients into celebrated delicacies.
1 Turtle
Suppon (Pelodiscus sinensis) is a pricey Asian delicacy that many Japanese diners prize for its alleged stamina‑boosting qualities. Some claim that consuming this soft‑shelled turtle can enhance energy, strength, and even virility, with extracts marketed as a dubious remedy for erectile dysfunction.
The turtles inhabit lakes, rivers, canals, ponds, and rice paddies across Honshu and Kyushu, feeding on fish, mollusks, insects, and local vegetation. Specialized farms raise them explicitly for culinary use, ensuring a steady supply for restaurants.
In metropolitan areas such as Kyoto and Tokyo, suppon commands a premium price—typically at least 10,000 yen (over $88) per serving. In contrast, rural eateries may offer the same dish at a fraction of that cost. Preparation traditionally involves cutting the turtle’s neck while the animal is still alive, allowing chefs to collect fresh blood, which diners can sip with or without sake. The remaining carcass is chopped and simmered in a nabe pot, producing a broth rich with vegetables and turtle meat. Variations also incorporate the collagen‑laden flesh into seafood soups, stir‑fries, and ramen bowls.
2 Horumon
The Japanese philosophy of mottainai—a reverence for avoiding waste—extends to the kitchen, where every part of an animal is put to use. This mindset birthed horumon, literally “things to discard,” a post‑World War II staple that celebrates off‑alley and tripe dishes.
Found chiefly in the Kansai region of Honshu, horumon features beef or pork organs such as diaphragm, esophagus, intestines, kidneys, liver, rectum, and stomach. These cuts are often skewered and grilled as horumonyaki, though many diners also relish them deep‑fried in batter (horumon tempura), stir‑fried with noodles, or simmered in a hot pot (horumon nabe).
Another beloved preparation is motsunabe, a hearty stew where pork or beef offal mingles with cabbage, garlic, soy sauce, and noodles, creating a comforting broth that showcases the flavors of each organ while embodying the spirit of resourcefulness.
3 Green Caviar (aka Sea Grapes)
Despite its glamorous nickname, “green caviar” (umi budou) is actually a type of seaweed harvested in the shallow waters surrounding Okinawa Island in southern Japan. The algae grow into clusters of tiny green spheres that, when kept in darkness, lose their hue, only to regain it once exposed to low‑intensity light.
Typically served raw in salads, the sea grapes are paired with a citrus‑based dipping sauce called ponzu. Their texture is famously slippery, and each sphere bursts in the mouth, releasing a faintly salty flavor. Chefs also use the seaweed as a garnish for dishes like smoked salmon blini and tuna sashimi, adding visual flair and a hint of brininess.
Nutrition‑wise, sea grapes are impressive, offering carbohydrates, protein, fiber, omega‑3 fatty acids, antioxidants, and a suite of minerals. However, some research points to the presence of cadmium in the species Caulerpa lentillifera, raising concerns about potential toxicity. The seaweed enjoys popularity beyond Japan, appearing on menus throughout the Philippines and Malaysia.
4 Novelty Ice Cream
Japan has earned a reputation for pushing the boundaries of frozen desserts, crafting novelty ice creams that feature ingredients most would consider daring. From raw horse meat to delicate tulip petals, the country’s ice‑cream scene offers a flavor for every adventurous palate.
One of the most iconic venues was Namco’s Namja Town, home to the now‑defunct Ice Cream City. Although the attraction closed, its legacy lives on: the park once served scoops infused with squid ink, soy sauce, oyster, shark fin, beer, and whiskey, among other bold concoctions.
Every May 9th, Saitama prefecture celebrates “Ice Cream Day,” where enthusiasts sample up to 100 distinct flavors. Unusual varieties have included crab, eel, and octopus. Regional specialties also abound—Kumamoto (Kyushu) offers octopus‑infused ice cream, while Yamagata (Honshu) serves jellyfish‑flavored scoops. In Bizen, you can find ice cream studded with deep‑fried oyster pieces.
For the truly intrepid, there’s even pit‑viper ice cream, a concoction that many describe as tasting like vomit, though others detect notes of garlic and almond. Some Japanese claim the venomous mamushi snake imparts aphrodisiac effects and boosts the nervous and circulatory systems.
5 Square Watermelons
Imagine a watermelon that fits perfectly into a refrigerator shelf or a stackable crate—that’s the vision behind Japan’s square watermelons, a quirky fruit‑shaping experiment that has become a niche market.
The concept originated as a practical solution to storage woes: traditional round melons are cumbersome to stack and occupy excess space. By growing the fruit inside square, glass‑covered cages, farmers could shape the melons to match the dimensions of common refrigeration units.
While the novelty attracted attention, the square melons never achieved mass popularity. They command a higher price than regular varieties, and the molding process prolongs ripening, often compromising taste and texture. Consequently, they are now primarily sold as decorative items, fetching several hundred dollars each.
This fascination with sculpted fruit has spread worldwide, inspiring producers in Brazil, the United States, Canada, China, and Panama to create “fashion fruits” such as skull pumpkins, watermelon hearts, and Buddha pears. In Japan, premium fruit is a common gift during seasonal occasions like Chūgen and Seibo. Notably, a pair of melons sold for over ¥3 million (about $27,000) at a Hokkaido auction in 2016, while oversized strawberries, grapes, apples, mangoes, and pears regularly command hefty prices for their flawless appearance.
6 Wasps, Hornets, Bees, And Their Larvae
While most people view these insects as unwelcome picnic intruders, many Japanese consider them a tasty delicacy. Even Emperor Hirohito was known to indulge in a diet that included wasps paired with rice.
In central Japan, a unique practice involves “wasp hunters” who attach tiny meat pieces to white flags and scatter them on forested slopes. Curious wasps take the bait back to their nests, where the flags allow hunters to track the insects’ flight paths.
Once a nest is located, the hunters use smoke to subdue the adult wasps. The larvae‑rich nest is then harvested, and the contents find their way into a variety of dishes. Japanese stores even sell canned wasp larvae, while vending machines dispense packets of bee larvae for adventurous snackers.
A similar technique is employed to capture the Asian giant hornet, often called the “yak killer.” These hornets are lured into containers filled with shochu alcohol, where they ferment and produce a potent, vitamin‑C‑rich juice. The larvae extracted from the nests are incorporated into appetizers, broths, and tempura, providing a protein‑packed bite for the daring.
Japan’s embrace of entomophagy has turned the country into a hotspot for tourists eager to sample rice grasshoppers, silk pupae, and giant water bugs, cementing its reputation as a culinary frontier for the bold.
7 Uo (Ice Gobies)
Another manifestation of “dancing” cuisine, shiro-uo—also known as ice gobies—are tiny, translucent fish that sometimes arrive at the table still alive. When placed in the mouth, these little creatures perform the traditional Japanese practice called odorigui, a dance of the palate.
The term odorigui broadly describes the consumption of seafood that continues moving, whether the creature is alive (as with shiro-uo) or recently deceased (as with dancing squid). In most cases, however, shiro-uo are served dead, typically as a topping for rice.
Caught throughout Kyushu and Honshu, live gobies command premium prices. Regional variations exist: chefs in Fukuoka (Kyushu) favor ice gobies, while those in Iwakuni (western Honshu) opt for whitebait. Food enthusiasts travel to Fukuoka’s Koharu restaurant, perched above the Muromi River, where local fishermen harvest the elusive fish.
Patrons at Koharu mix the gobies with a vinegar‑and‑egg concoction, then use chopsticks to either chew the tiny fish or swallow them whole, fully immersing themselves in the odorigui experience.
8 Dancing Squid
The dancing squid, or katsu ika odori‑don, is both a culinary curiosity and an internet sensation. When the freshly killed squid is drenched in soy sauce, the salt triggers an electrical response that makes its tentacles twitch, creating the illusion that the creature is still alive.
Even though the squid’s nervous system remains functional after death, the sodium chloride in the sauce induces action potentials in the tentacle’s sensory neurons. These signals cause the muscles to contract and relax, thanks to residual ATP energy stored in the cells, resulting in a lively “dance.”
The dish has sparked controversy, with some viewers accusing it of cruelty. However, chefs remove the squid’s brain during preparation, ensuring the animal cannot feel pain.
Diners can find the dancing squid at Ikkatei Tabiji in Hakodate, where it is commonly served alongside rice, salmon roe, and shiso leaves, offering a theatrical dining experience.
9 Kare Donatsu
Japan took the Indian staple of curry and gave it a uniquely Japanese twist by inventing kare donatsu, a deep‑fried doughnut stuffed with a rich curry filling. Priced modestly, this snack appears in bakeries and convenience stores nationwide. Tokyo’s Toyofuku bakery proudly boasts a century‑long tradition of crafting kare donatsu using locally sourced beef.
The popularity of the curry doughnut inspired confectionery giant Tirol to launch “curry chocolates,” bite‑size treats that combine chocolate, curry, and a crunchy bread core. The craze even birthed a superhero—“Kare Pan Man,” a cartoon hero fashioned entirely from curry bread.
Curry entered Japan in the mid‑1800s, likely introduced by English merchants in the port city of Kobe. It quickly spread through cookbooks and became a staple of the Japanese navy’s diet.
In the 1930s, a Japanese merchant sampled curry rice aboard a European steamship, returned home, and began selling an affordable version in an Osaka department store. The dish’s success sparked a wave of curry houses across the nation.
10 Fish Sperm (Shirako)
The Japanese palate includes a fondness for piscine semen, known locally as shirako and referred to in English as “milt.” While the dish has traveled globally, with Russians enjoying herring milt (moloka), it remains a specialty in Japan.
Resembling the intricate folds of a brain, shirako is actually the fluid‑filled sperm sac of fish, most often harvested from cod, though salmon, pufferfish, and anglerfish are also used.
Chefs serve shirako in myriad ways: battered and deep‑fried, sautéed, simmered in hot pots, or raw with spring onions, leeks, and a citrus dressing for the adventurous. Its flavor profile is creamy, mildly sweet, and bears a faint tofu‑like note.
Beyond its striking appearance, shirako offers nutritional benefits, delivering vitamin B, calcium, potassium, and protein, making it a surprisingly wholesome delicacy that rivals caviar in both texture and prestige.