Japan (national; originally introduced from China; cultivated since ancient times)
Shiso (紫蘇 — perilla, Perilla frutescens) is Japan's most versatile aromatic herb, existing in two primary varieties with distinct applications. Aojiso (青紫蘇 — green shiso): the more commonly used fresh herb with a complex flavour combining mint, basil, anise, and citrus — a genuinely unique aromatic profile without Western equivalent. Used whole as a wrapping leaf for sashimi, chiffonaded as a garnish, deep-fried in tempura batter, or pounded into dressings. Akajiso (赤紫蘇 — red shiso): the red-purple variety essential for umeboshi production — the red pigment (perillaldehyde and anthocyanin) from akajiso leaves turns pickled plums their characteristic magenta colour. Also used for akajiso juice (shiso syrup), red shiso furikake, and shibazuke (Kyoto's purple pickles of eggplant and cucumber). The fragrance compounds in shiso — perillaldehyde (the primary aroma compound), limonene, and linalool — degrade rapidly; shiso should be torn or cut immediately before use. Pre-cut shiso sitting more than 30 minutes loses 70% of its fragrance intensity.
Aojiso: minty, basil-adjacent, anise, bright citrus, cooling; akajiso: more camphor-like, less citrus, strongly pigmented — two distinct flavour profiles from the same plant species
{"Fragrance preservation: only cut or tear shiso at the moment of use — the volatile perillaldehyde responsible for characteristic aroma oxidises within minutes of cell damage","Chiffonade rolling technique: roll multiple leaves together into a tight cylinder before slicing to minimise cell damage and oxidation surface area","Akajiso pickling ratio: for umeboshi production, use 20g akajiso leaves per 1kg ume plums; blanch leaves first in the ume vinegar (brine) to develop the magenta pigment before adding back","Tempura batter application: dip the smooth side of shiso leaf into batter, leaving the rough underside exposed — the textural contrast creates a more interesting fried leaf","Shiso as sashimi protection: the antimicrobial properties of shiso (perillaldehyde has demonstrated bacteriostatic effects) traditionally served as natural food safety alongside raw fish"}
{"Aojiso ponzu: blend fresh aojiso leaves with ponzu, rice vinegar, and sesame oil for a herb-forward dressing for cold noodles and grilled vegetables","Shiso preservation: store whole uncut shiso stems in a glass of water (like flowers) in the refrigerator — lasts 7–10 days vs 2–3 days if loosely wrapped","Akajiso juice recipe: simmer red shiso leaves in water for 15 minutes, strain, add lemon juice and sugar — the lemon acidity triggers the magenta colour development through pH chemistry"}
{"Pre-cutting shiso for service — the fragrance halflife is very short; cut per-plate, per-order only","Using only one variety without understanding differences — aojiso for fresh/aromatic applications; akajiso for pickling and colour — they are not interchangeable","Over-heating aojiso in cooking — brief contact (tempura, quick stir-fry) preserves some aromatics; prolonged heat destroys them entirely and creates bitterness"}
Japanese Cooking: A Simple Art — Shizuo Tsuji / The Japanese Kitchen — Hiroko Shimbo