Jams

Confiture de fruits acidulés (tart-fruit jam) teaches one governing rule: measure the sugar against the fruit's own tartness. For gooseberries, blackcurrants, and tart plums, that means equal weights, or very nearly so. More sugar smothers the fruit and encourages crystals; less forces you to boil away the freshness before the preserve will set.

The old preparation assumed a preserving kitchen with broad copper bassines, generous quantities, and a cook who judged the boil by sight. Your honest equivalent is a wide stainless-steel pan, a digital thermometer, two cold saucers, and eight small jars. This formula chooses the book's first family, fruit cooked directly with sugar; its second family, gelée made from strained juice, needs fruit-specific extraction and deserves its own method. The copper and the brigade batch are scaffolding. The fruit-to-sugar balance and the short, decisive boil are the dish.

Dissolve every grain before the hard boil begins, then judge the set promptly. That is the step that matters most. Stop too early and the preserve remains loose and vulnerable to fermentation; push too far and its colour darkens, its flavour flattens, and the syrup can crystallise. One cook, one stove, one evening, and enough confiture to brighten many breakfasts.