Mustard seed (brown) — flavouring profile

Brown mustard's heat is volatile and rushes to the nose — the same sharp, eye-watering pungency family as wasabi and horseradish — so beyond the high acid every mustard needs, it wants a wine that can disperse or gently tame the burn rather than meet it head-on.

The compounds that matter. Brown seed (Brassica juncea) stores sinigrin; crushed and wetted, the enzyme myrosinase releases allyl isothiocyanate — the volatile, nose-clearing heat. Because this molecule lifts off into the nose rather than settling on the tongue, brown mustard reads sharper and more aggressive than the yellow seed's mild, non-volatile warmth. Like other pungent irritants it is inflamed by alcohol, blunted by a touch of sweetness and physically dispersed by carbonation; and like all mustard it needs high acid beneath it or the wine collapses. Tempered whole in hot oil — the backbone of Indian tadka — the seed pops and turns nutty, its pungency tamed and a toasty, savoury note taking over.

What it demands of a wine. High acid, always. Then a way to handle a sharper heat than yellow mustard brings: modest alcohol so there is little to inflame, a touch of residual sugar to soften the burn where the seed is raw and pungent, or the spritz of a sparkling wine to scatter it. Little or no oak — vanilla and toast blur the clean, green edge while oak's lower acid sags. Light to medium body; the green, faintly vegetal note that bridges to the seed is a bonus.

Seek. High-acid whites with a cooling angle. Off-dry Riesling is the standout, its trace of sweetness damping the volatile heat while the acid stays bright. A high-acid traditional-method sparkling scatters the pungency on the spritz and refreshes between mouthfuls. Bone-dry, green-toned Sauvignon Blanc and Grüner Veltliner meet the milder, tempered seed on its own green ground. Where the seed is fried nutty in oil, a light, low-tannin red such as Gamay sits well too.

Avoid. Low-acid aromatic whites — Gewürztraminer, Viognier, oaked low-acid Chardonnay — are flattened and turned blowsy by the pungency. High-alcohol or firmly tannic reds inflame the volatile heat and clamp down hard. Heavily oaked wines set sweet vanilla against the sharp, savoury bite and lose their freshness.

Three to reach for. Off-dry Riesling (Mosel Kabinett); a high-acid traditional-method sparkling (Crémant or Champagne); Sauvignon Blanc (Marlborough).