Filbert Ice-cream

Glace aux avelines (filbert ice cream) teaches one exact lesson: torréfaction, light dry toasting, must stop at pale gold. Heat wakes the filberts' fragrant oils, but one shade too dark makes them bitter, and neither sugar nor cream can hide it. That is the one true thing to know before you touch a pan.

The book's compact instruction assumed a pastry section with boiled milk ready, a heavy mortar for pounding, a familiar ice-cream base, and a salt-and-ice freezing pail worked by another pair of hands. This home version keeps its 3½ ounces of filberts, its milk-softened paste, and its twenty-minute infusion exactly where they belong, then writes out a one-quart crème anglaise (stirred custard) and hands the pounding to a food processor and the freezing to a countertop churn. The large service quantity and freezing pail were brigade scaffolding. The light toast and hot-milk infusion are the dish, and they stay.

The finished glace is pale ivory with fine russet flecks, full of warm hazelnut fragrance but clean and milky on the tongue. Nothing needs vanilla, caramel, or liqueur to announce the nut. One cook, one stove, one evening. Before you begin, learn the colour that decides everything: pale gold, never brown.