Japan — shiso cultivation recorded from at least the Heian period; considered a quintessentially Japanese herb despite its Southeast Asian origins; now ubiquitous across Japanese culinary culture
Shiso (紫蘇 — Perilla frutescens var. crispa) exists in two primary forms in Japanese cooking: ao-jiso (green perilla, also called 'ōba') and aka-jiso (red perilla). The two varieties are related but have distinct culinary roles. Ao-jiso is the aromatic herb used raw as a sashimi garnish, in salads, wrapped around miso-grilled preparations, torn over cold soba, made into shiso chiffonade for rice dishes, and used in tenpura. Its flavour is clean, peppery, anise-like, with a distinctive freshness that bridges Japanese and Southeast Asian herbal registers. Aka-jiso (red/purple perilla) has a more intense, slightly astringent flavour and is primarily used for colouring and flavouring umeboshi (the red pigment of traditional umeboshi comes entirely from aka-jiso) and for making shiso juice (a purple-red summer drink). Chirimen jako (small dried anchovies) fried with ao-jiso and sesame is a classic flavour trio. Shiso tempura requires the largest, freshest leaves — the visual beauty of the deep-fried whole leaf is as important as the flavour. Shiso also has potent antimicrobial properties (rosmarinic acid and perillaldehyde) that historically functioned as a preservative in sashimi presentations.
Ao-jiso: clean, peppery, anise-like freshness with a cooling, bright quality; aka-jiso: more intense, astringent, peppery-medicinal; together their flavour anchors the sensory experience of Japanese summer cuisine
{"Ao-jiso is the raw herb; aka-jiso is primarily a colouring and flavouring agent for umeboshi and beverages","Antimicrobial properties of shiso are functional in sashimi presentations — not merely decorative","Shiso chiffonade: roll the leaves tightly, slice very thin — immediately transfer to ice water to prevent oxidation and blackening","For tempura: single whole leaves, patted dry, batter applied to one side only — the other side remains uncoated and visible","Store ao-jiso upright in a glass of water in the refrigerator — it wilts rapidly in sealed bags; standing water keeps it firm"}
{"Shiso juice (aojisu juice): blend ao-jiso with water, strain, add citric acid and sugar — a vivid green summer drink with herbal cooling character","Aka-jiso vinegar: steep fresh aka-jiso in rice vinegar with salt and sugar — produces a gorgeous deep red vinegar for summer preparations","Shiso miso: blend ao-jiso with white miso, mirin, sesame — spread on onigiri or dengaku tofu for a herbal, aromatic flavour","Ao-jiso as a tempura ingredient shows both sides of the leaf — the green side more vivid; the back side slightly pale and textured"}
{"Storing shiso in sealed plastic bags without water — wilts and blackens rapidly; store standing in water like cut flowers","Preparing shiso chiffonade in advance — oxidation turns the cut surfaces dark within minutes; prepare at service time only","Using aka-jiso raw as a garnish — its astringency and intense pigment make it unsuitable for the delicate garnish role of ao-jiso","Substituting Thai basil or mint for shiso — while partially related, the flavour profiles are distinctly different; shiso is not reliably substituted"}
Japanese Cooking: A Simple Art (Shizuo Tsuji) / Japanese Farm Food (Nancy Singleton Hachisu)