MUSTARD SEED (BROWN)

Brown mustard has been cultivated in India and China for over 4,000 years — it is one of the foundational spice and oilseed crops of South Asian agriculture. India is the dominant world producer of both seed and seed oil. The defining culinary technique is tadka — the South Indian practice of frying whole mustard seeds in hot ghee or oil until they "pop" (releasing their volatile allyl isothiocyanate), then pouring the flavoured oil over the prepared dish. In European cooking, brown mustard is the basis of Dijon mustard (the original French recipe uses brown mustard seeds combined with white wine and verjus). In gin, mustard seed is an unusual contemporary botanical providing sharp aromatic warmth.

Mustard Seed brings sharp pungent warmth with an aromatic green edge. A quarter to half sachet is plenty — full sachet use risks tipping a gin into Bloody-Mary-only territory. Pair with curry leaf and coriander for a South Indian-style profile, or with cumin and fenugreek for a deeper spice-route blend.

Sinigrin is the precursor compound — a glucosinolate stored stably in intact seeds. When seeds are crushed and exposed to water or alcohol, the enzyme myrosinase converts sinigrin into allyl isothiocyanate (AITC) — the same volatile compound that defines horseradish and wasabi. [source] AITC is the source of mustard's characteristic "sinus-clearing" sharp heat. Phenolic acids contribute background astringency. AITC is volatile and heat-sensitive — cool extraction preserves the sharp character; warm extraction develops a milder, more cooked-spice register.