Japanese Shiso Varieties and Culinary Applications

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