You can tell an unagi (eel) shop by its smoke. The sweet smell of scorching tare (the soy-mirin glaze) reaches you first, and then the toasty note of charcoal follows. On doyo-no-ushi — literally the "Day of the Ox" within the late-summer doyo period — that smell is at its thickest of the whole year. But I'm not here just to tell you to eat eel. Why this day, why it's expensive (and yet cheaper this year), and what to eat on the days you don't splurge — so the heat goes down easier. I've checked the date and the numbers one at a time, and I separate "popular legend" from "fact" in the origin story. Read to the end and you'll be able to plan the ushi-day table yourself. My rule, always: not the list of famous shops, but the one place you'll want to return to.

What doyo-no-ushi is — in 2026 it's July 26, a single ox-day

Doyo refers to a roughly 18-day stretch at each change of season, falling just before the first days of spring, summer, autumn, and winter. The summer doyo lands in the hottest part of the year, and within it comes the day of "ushi" (the Ox) from the Chinese zodiac — that's doyo-no-ushi-no-hi, the Day of the Ox. Because ox-days recur every twelve days, some years see two of them fall inside the 18-day doyo. If there's one, it's the ichi-no-ushi (first ox); if two, the later one is the ni-no-ushi (second ox).

Summer doyo-no-ushi in 2026 is Sunday, July 26. This year the ox falls only once, so there is an ichi-no-ushi but no ni-no-ushi. If you remember one date, make it July 26. Prices and crowds at supermarkets and specialist shops spike sharply on that day and the day before (July 25). If you want to dodge the crush, the realistic move is to shift a few days off the ushi-day itself.

Note that doyo isn't only a summer thing. In 2026 the ox-days fall on April 21 (spring), July 26 (summer), October 30 (autumn), and in January 2027 (winter; generally late January). The strong "eel equals summer" association comes from the summer marketing we'll get to below — on the calendar, doyo comes around several times a year.

Why eel — the Hiraga Gennai "legend," and the nutrition that's fact

The most famous origin story for eating eel on the ox-day is the tale of Hiraga Gennai, an Edo-period scholar of Western learning (rangaku). An eel shop struggling with poor summer sales, the story goes, took Gennai's advice to post "Today is doyo-no-ushi-no-hi" out front — and business boomed. But I want to be clear that this is firmly a popular legend. It isn't backed by primary historical sources, and its truth is uncertain. It's told as the origin myth of a clever ad campaign; treating it as settled history would not be accurate.

What is close to fact is the case for eel in summer. Unagi is rich in fat and protein and in vitamins A and the B group, so it tops up energy and nutrition efficiently in the heat, when appetite fades. "It gives you stamina" isn't a scientific claim, but that eel is a nutrient-dense food certainly is. Honestly, though: the fat is heavy, so it's not something to force down in large amounts when your stomach is already struggling in the heat.

Here's the irony — eel's true season for richness is autumn into winter, when the fat builds. So "summer eel" is less about peak flavor than a cultural habit, where heat-beating nutrition met the annual ox-day event. Chase the peak season and you go in autumn; eat it as a ritual and you go in summer. Splitting it that way makes it easy to understand.

Kabayaki or shirayaki, Kanto or Kansai — choose by the blueprint of flavor

How you enjoy eel splits first on "tare or the eel itself." Let me set the criteria up front — (1) intensity of flavor, (2) how much the eel's own character comes through, (3) suitability for first-timers. Kabayaki (grilled with layers of the sweet-savory tare glaze) is the bold, rice-friendly version. Shirayaki ("white-grilled," no tare, grilled plain) is eaten with wasabi-soy or salt to taste the eel's natural sweetness and fat. For a first time I steer people to kabayaki as the safe choice, and call shirayaki an intermediate-to-advanced pick for those who want to check the eel's flavor itself.

On presentation: served in a lacquer box it's una-ju; in a bowl it's una-don. The eel inside is the same, but una-ju is often the larger, pricier tier. And Nagoya's hitsumabushi (chopped kabayaki mixed into rice in an ohitsu wooden tub) makes the eating method itself the attraction — bowl one, eat it plain for the toasty char; bowl two, add yakumi (condiments: shredded nori, wasabi, scallion) for a flavor switch; bowl three, pour dashi broth over it as ochazuke; bowl four, whichever way you liked best. A single serving that shifts flavor three times is easy to recommend to travelers who want to "experience" eel for the first time.

The other big divide is the Kanto vs. Kansai style. Criteria first again — the cut, whether it's steamed, and the texture. In Kanto the eel is cut along the back (se-biraki), steamed once, then grilled, which renders off excess fat for a soft, fluffy bite that melts in the mouth. In Kansai it's cut along the belly (hara-biraki) and grilled directly without steaming, so the skin is crisp and aromatic and the flesh keeps a bit of bounce. Soft and refined: Kanto. Toasty and substantial: Kansai.

  • The cut: Kanto = se-biraki (cut along the back) / Kansai = hara-biraki (cut along the belly). Lore says Edo, full of samurai, disliked the belly cut for its echo of seppuku (ritual disembowelment), while merchant-culture Kansai favored hara wo watte hanasu, "to talk belly-open" (i.e., openly) — both are popular sayings, not documented fact.
  • The grilling: Kanto = grill plain, then steam, then glaze and grill / Kansai = grill directly, no steaming. The presence or absence of the steaming step is the biggest difference.
  • Texture and taste: Kanto = soft, fluffy, refined / Kansai = crisp skin, aromatic, with bounce in the flesh. Neither is superior — it's a matter of preference.

Endangered, yet cheap this year — the honest take on price and sustainability

You can't talk eel without talking stock and price. Facts first. The Japanese eel (Anguilla japonica) is listed as Endangered (EN) on the IUCN Red List (most recently assessed in November 2018, with the population described as declining). The drivers are long-term overfishing, habitat degradation from river engineering, and the difficulty of pinpointing its spawning grounds. I want to set that down as the fixed premise.

And yet the 2026 storefront tells a slightly different story. Glass eels (shirasu-unagi, the juveniles) had their best catch in about five years — more than double the previous year's haul in Kyushu and Shikoku — and reports put the juveniles' trading price 70-80% below the year before. The biggest factor is said to be the end of the Kuroshio Current's "large meander" (kuroshio dai-dakou). When juveniles are plentiful and cheap, grown-eel prices tend to follow down, and reports flag the possibility that supermarket and restaurant una-ju could ease from autumn onward (all of this is an outlook as of 2026).

On the international front: at the 20th CITES Conference of the Parties (November-December 2025), the EU proposed listing all Anguilla eel species on Appendix II, but the First Committee voted it down 35 in favor to 100 against, and the rejection was confirmed in plenary. So as of 2026, no CITES restriction on international trade is in place. But the proposal could return — the resource problem itself hasn't gone away.

How to hold all this? Here's how I square it: 2026 happens to be a cheap year thanks to the glass-eel boom, but the species is still endangered, and there's no guarantee the good catches continue. So rather than "it's cheap, let's have it weekly," a distance of "eat it properly once, as a ritual, on the ox-day" ends up fitting better — for the stock and for your wallet. Prices here are an as-of-2026 guideline only, and they move a lot by farmed vs. wild, domestic vs. imported, and size. Before you pounce on the low price, keep that premise in mind.

For the days you won't splurge on eel — the cold summer staples

Cheap year or not, you don't eat eel every day. What really carries the Japanese summer table is the cold dishes that go down without firing up the stove. Criteria up front here too — (1) effort (speed), (2) coolness and how easily it slides down, (3) whether it satisfies as a meal. The hotter the day and the less you want to cook, the more these criteria earn their keep.

There's also a saying that during doyo you should eat foods beginning with the sound "u" beyond unagi — umeboshi (pickled plum), udon, and uri (gourds: cucumber, watermelon, kabocha squash). It's a lucky-charm bit of folklore, but the lineup — sourness, water content, light carbs — does go down easily on a heat-tired body, so there's a sensible core to it. On the days eel is out of reach, the cold staples below will see you through the summer just fine.

The list below is the summer regulars, arranged by my criteria. It's not a ranking — pick by the day's condition (how tired you are, how much time, how much appetite). None of them are some grand revelation; they're just the dishes that let a summer body exhale, the ones you'll want to eat again.

  • Hiyashi chuka (chilled ramen): criteria = fairly filling / a bit more effort. Cold Chinese-style noodles topped colorfully with kinshi-tamago (shredded egg crepe), ham, cucumber, and tomato, dressed in a tangy soy sauce or a sesame sauce. There's prep in slicing the toppings, but it's a complete plate with protein and vegetables. Good for a lunch when you want to eat properly.
  • Somen / nagashi-somen (flowing somen): criteria = fastest, coolest. Boil 1-2 minutes, shock in ice water, dip in tsuyu — that's it. The thin strands slide right down, so they go in even on a zero-appetite day. The flip side is they're too light to keep you full; a touch of yakumi (ginger, myoga, scallion) or toppings raises the satisfaction. Nagashi-somen (catching somen as it flows down a bamboo flume) is more experience than flavor — for days with kids or a crowd.
  • Zaru soba: criteria = throat feel plus aroma. Cold, firmed soba dipped in tsuyu with wasabi and scallion. The buckwheat aroma and the slide down the throat carry the cool. More substantial than somen, and the slurp itself is part of the summer-lunch ritual. At a shop that serves soba-yu (the cooking water), finish by thinning the leftover tsuyu with it.
  • Hiyashi udon (bukkake or zaru): criteria = chewy texture plus staying power. Ice-firmed udon is thicker than somen or soba, with real chew and heft. Top it with tenkasu (tempura bits), raw egg, grated daikon, or sudachi citrus and it stands as a full meal. For the day you want noodles to actually fill you up.
  • Kakigori (shaved ice): criteria = not a meal, the peak of cooling. Shaved ice with syrup, and increasingly serious versions using real fruit or milk. It's strictly dessert or a snack — it won't make a meal on its own — but it drops your summer body temperature the fastest. The melt of the ice, and even the brain-freeze, are part of the season.