Walk past a Japanese produce stall in midsummer and you’ll likely catch a sharp, herbal scent somewhere between mint, basil, and citrus. That’s shiso — a leaf so central to Japanese cooking that most visitors eat it several times without ever learning its name. It’s the green frill tucked under your sashimi, the red tint in your umeboshi, the hidden ingredient in a surprisingly refreshing summer soda. Here’s how to recognize it, where to taste it properly, and what to bring home once you’re hooked.
What Is Shiso, and Why Does It Smell Like That?
Shiso (紫蘇) is a member of the mint family, botanically related to perilla, and it grows across Japan from early summer through autumn. The smell comes from perillaldehyde, an aromatic compound unique enough that nothing in a Western pantry quite substitutes for it — people often describe it as “mint meets basil meets a hint of anise,” though once you’ve smelled the real thing, no description does it justice.
Japanese cooks use shiso for three main reasons: as a palate-cleansing garnish, as a natural antibacterial wrapped around raw fish (which is partly why it shows up with sashimi), and as a dye for pickles. It’s cheap, it’s everywhere from late May to September, and almost no one outside Japan grows it for the table, which makes it one of the more distinctive flavors you can chase during a trip.
Green vs. Red: The Two Shiso Varieties Worth Knowing
There are two main types sold in Japan, and they’re used for different things:
- Aojiso (青紫蘇) / Oba (大葉): the green variety, sold in small plastic-wrapped bundles of 10 leaves for around ¥150–250 at any supermarket. This is the one used fresh — as a sashimi garnish, shredded into salads, or wrapped around rice.
- Akajiso (赤紫蘇): the purple-red variety, with a more astringent, almost floral flavor. It appears for a narrow window in June, almost exclusively for pickling umeboshi (pickled plums) and dyeing them pink, or for making shiso juice (see below). You generally won’t find it fresh outside early summer.
If a menu or package just says “shiso” without specifying, assume it means the green aojiso — it’s by far the more common of the two in everyday cooking.
Dishes Where Shiso Is the Star
A few dishes actually put shiso in the spotlight rather than using it as a background note:
- Shiso tempura (紫蘇の天ぷら): whole leaves dipped in a light batter and fried, usually served as part of a tempura set at izakaya for ¥100–300 per piece. The fried leaf keeps its aroma, which is a genuinely surprising contrast to the oil.
- Umeboshi onigiri with shiso: convenience stores sell a version wrapped in a shiso leaf instead of nori — look for “梅しそ” (ume-shiso) on the label at Lawson, 7-Eleven, or FamilyMart, around ¥130–160.
- Shiso maki: raw tuna, salmon, or horse mackerel rolled in a shiso leaf before grilling or serving raw — common at izakaya and home-style restaurants.
- Shiso in tamagoyaki: some home cooks and small restaurants fold finely chopped shiso into the sweet rolled omelette for a herbal counterpoint. If you want to try making this at home, our guide to tamagoyaki pans and how to use one covers the equipment and basic technique.
- Hiyashi chuka and cold somen: shredded shiso is a standard summer topping on cold noodle dishes, served alongside shredded egg and cucumber. If you’re in Kyoto in July or August, eating these noodles with your feet over a mountain stream at a kawadoko riverside dining platform is one of the most pleasant ways to experience both the dish and the season — most platforms run from roughly early May through September and require reservations a few days ahead.
Shiso in a Glass: Juice and Umeshu
Red shiso’s other major job is flavoring drinks. Shiso juice (しそジュース) is a traditional early-summer drink, especially popular in Nagano and Yamagata, made by boiling red shiso leaves with sugar and a splash of vinegar or citrus, which turns the liquid a vivid magenta. It’s sold bottled at roadside rest stops (michi-no-eki) and farmers’ markets for roughly ¥400–700, usually served diluted with water or soda over ice. It tastes tart, faintly sweet, and much less “herbal” than the raw leaf — most first-timers are surprised how approachable it is.
Some craft breweries and izakaya also make a shiso sour or shiso highball using shiso-infused shochu, and a handful of umeshu (plum liqueur) producers add red shiso to their blend for color and a drier finish. If you’re building out a Japan drinks itinerary, it’s worth pairing a shiso-based stop with something like our rundown of Japan’s non-alcoholic beer boom for contrast — shiso soda is one of the better non-alcoholic options at an izakaya table if beer isn’t your thing.
Where and When to Find the Best Shiso
Green shiso is available in supermarkets year-round, but it’s at its most fragrant and cheapest from June through August, when domestic greenhouse and field production peaks — Aichi Prefecture is Japan’s largest producer of green shiso leaves, so restaurants there tend to use it generously. Farmers’ markets (look for signs reading 直売所, “chokubaijo”) near rural train stations often sell bundles far larger than the 10-leaf supermarket pack for the same price or less.
Red shiso has a much shorter window — it typically appears in markets for just a few weeks in June, timed to coincide with umeboshi-pickling season. If you want to see or buy it fresh, June is the month to be in Japan; outside that window you’ll mostly find it processed into juice, dried furikake, or pickles.
Bringing Shiso Home: Furikake and Shelf-Stable Picks
Fresh leaves won’t survive a flight, but several shelf-stable shiso products travel well and make easy, lightweight souvenirs:
- Yukari (ゆかり): the best-known brand of dried, salted red shiso furikake, made by Mishima Foods. It’s a bright pink-purple seasoning for rice, sold in small shaker bottles for about ¥350–450 at any supermarket, convenience store, or Don Quijote. This is the single easiest shiso souvenir to pack — no refrigeration, no liquids, no customs concerns.
- Shiso-flavored rice crackers and candy: less essential, but widely available in souvenir shops and worth a try if you like the flavor in sweet form.
- Bottled shiso juice concentrate: some brands sell a shelf-stable syrup version rather than the fresh-made drink, which can be checked in checked luggage (not carry-on, due to liquid limits) and diluted at home.
- Shiso seeds: garden centers and some department store food halls sell seed packets if you want to grow your own — it’s an easy, fast-growing plant in a temperate climate.
If you’re stocking a suitcase with other condiments on the same trip, Yukari pairs naturally with a jar of Kewpie mayonnaise — a spoonful of each stirred into rice or over sliced tomatoes is a quick way to recreate a Japanese home-kitchen flavor once you’re back.
Common Mistakes Visitors Make with Shiso
- Assuming it’s just a garnish to push aside. The leaf under your sashimi is edible and meant to be eaten alongside the fish — it’s not a decorative plate liner like a parsley sprig.
- Confusing it with mint or basil on an English menu. Translated menus sometimes render shiso as “beefsteak plant” or simply “herb,” which undersells how distinctive the flavor is. If a dish lists an unfamiliar herb and you’re in Japan in summer, it’s worth asking “shiso?” to confirm.
- Buying red shiso expecting it to taste like the green kind. Akajiso is more astringent and almost never eaten raw in quantity — it’s meant for pickling or boiling, not for tossing into a salad.
- Skipping the juice because “vegetable juice” sounds unappealing. Shiso juice is sweet-tart and closer to a hibiscus or cranberry drink than anything vegetal — don’t judge it by the description.
Shiso is one of those ingredients that rewards curiosity: once you know what to look for, you’ll start spotting it on nearly every menu from a convenience store onigiri wrapper to a kaiseki tasting course, and a ¥400 bottle of furikake is a far more memorable souvenir than most gift-shop trinkets.