Chervil Vinegar

Ingredients

• half bottle fresh or dry chervil leaves
• good vinegar

Method

Pack the bottle half-full with chervil leaves — fresh or dried, though fresh will give you a brighter, more delicate anise note. The leaves should be loosely arranged, not compressed. Pour in your vinegar (white wine or cider work best; avoid distilled unless you're after pure sharpness) until the bottle is full. The liquid will extract the volatile oils from the leaves through infusion, drawing out the subtle liquorice-like compounds that define chervil's character.

Heat the sealed bottle in a bain-marie — a bowl of gently simmering water — until the vinegar reaches blood temperature, around 50–60°C. You're not boiling hard; you're warming the mixture enough to accelerate the extraction without driving off the aromatic esters that make chervil worth infusing in the first place. This gentle heat also helps stabilise the preservation by reducing any microbes clinging to the dried leaves. Leave the bottle submerged for 20–30 minutes, then remove it and let it cool to room temperature. Do not leave it in hot water — the residual heat will continue to cook the leaves.

Cork the bottle tightly once it's cool. Store it somewhere dark and at a steady temperature — a cupboard is ideal, not the windowsill. The infusion develops over two weeks as the alcohol in the vinegar (even mild vinegars contain acetic acid and residual ethanol) continues to strip the leaf tissue of its flavour compounds. After a week, hold the bottle to the light and taste a few drops on a spoon. You're looking for a pronounced chervil flavour that's clean and herbaceous, not muddy or over-extracted. If it tastes there, strain out the leaves through fine cloth and bottle again. If it needs another week, leave it be.

Strain the vinegar through muslin or a fine sieve once it reaches your preferred intensity. Discard the spent leaves — they've given what they have. Decant into a clean bottle and seal. This vinegar will keep for months, even years, and won't degrade significantly because the acidity acts as its own fermentation barrier. Use it in vinaigrettes for fish, in béarnaise sauce, or sharp enough to cut through rich court-bouillon.