Japan — shiso (Perilla frutescens var. crispa) as essential Japanese herb and flavouring ingredient; both green and red varieties
Shiso (紫蘇, also called Japanese basil or perilla) is one of Japan's most characteristic herbs — distinctive in flavour (an intersection of mint, anise, basil, and cinnamon), visually striking (jagged leaf edges), and botanically from the mint family (Lamiaceae). Two primary Japanese varieties: ao-jiso (青紫蘇, green shiso) is the fresh leaf used in sushi, sashimi garnish, salads, tempura, and as a aromatic wrapper — the version commonly encountered in Japanese restaurants globally. Aka-jiso (赤紫蘇, red/purple shiso) is used primarily in pickling (umeboshi production — the red colour of umeboshi comes entirely from aka-jiso), in salted pickles, and as an ingredient in umeshu (plum wine). Culinary applications of ao-jiso: as chiffonade over sashimi and as a sashimi divider, wrapped around nigiri fish to add aromatic flavour, in tempura batter (shiso no tempura is a classic), as a roll wrapper for natto or cream cheese (shiso maki), as a herb in salads with Japanese dressing, blended into sauces and dressings, and as a garnish where its aromatic quality is the primary purpose. The anthocyanin pigment in aka-jiso is pH-sensitive — it turns vivid red when acidified (the mechanism behind umeboshi's red colour). Shiso flowers (hojiso) are used as a garnish in autumn, the individual florets scattered over sashimi or chawanmushi. Shiso seeds (shiso no mi) are a specific autumn garnish — tiny green bead-like seeds with a concentrated shiso flavour used to garnish sashimi in early autumn.
Ao-jiso: complex herbal — simultaneously minty, anise-adjacent, basil-like, with a slight camphor note; bright and aromatic; adds distinction to anything it accompanies without dominating; it is the herb that makes Japanese food smell Japanese. Aka-jiso: more bitter and earthy, less aromatic, primarily functional as a colourant and mild flavouring in pickling
{"Ao-jiso flavour is highly volatile — aromatics dissipate rapidly after cutting; use immediately or store between damp paper towels","Chiffonade technique: stack leaves, roll tightly, cut perpendicular for fine strips — maximises surface area for aroma release","Aka-jiso's red pigment is pH-dependent — acid turns it red, alkaline turns it green/purple (used intentionally in pickling)","Shiso in tempura batter: leaf placed face-down in batter, fried on the face side first — the back side batter creates the crust; the face side shows through lightly","Seasonality: shiso is a summer herb with peak flavour June–September; year-round greenhouse production lacks the intensity of summer field-grown","Shiso flowers and seeds appear in autumn only — they signal seasonality more precisely than the leaves alone"}
{"Shiso-infused sake: steep a handful of fresh shiso leaves in sake overnight in the refrigerator — extraordinary aromatic infusion","Growing shiso at home: it thrives in containers and produces abundantly June–September; the home-grown intensity exceeds supermarket quality significantly","Shiso and tomato: an unexpected but excellent combination — the herbaceous quality contrasts the acid-sweet tomato","Shiso no karaage: deep-fried whole shiso leaves as a textural garnish — the leaf crisps transparently with intense flavour concentration","The back of the shiso leaf is rough-textured and slightly more bitter than the smooth front — kaiseki chefs use this orientation deliberately"}
{"Substituting Thai basil for shiso — completely different flavour profile; Thai basil's anise-clove note differs from shiso's minty-herbal complexity","Adding shiso to hot dishes early — heat destroys the volatile aromatics; add at the very end off heat, or use as a fresh garnish","Cutting shiso far in advance — the cut edges oxidise and discolour within 20–30 minutes","Using aka-jiso as a fresh herb — it is significantly more bitter and less pleasant to eat fresh than ao-jiso","Not using shiso flowers and seeds when in season — these ephemeral garnishes appear only in late summer/early autumn and are among Japan's most beautiful seasonal food signals"}
Japanese Ingredients Reference; Seasonal Herb Documentation