Red-currant Ice

Glace aux groseilles teaches the structural work sugar does in a frozen dessert. The one true thing to know before touching the pan is this: sugar controls texture as surely as it controls sweetness. Too little and the ice freezes hard and coarse; too much and it slumps without setting. Red-currant juice brings such clean, forceful acidity that lemon would only muddy the lesson.

The original entry assumed a pastry pantry with strained juice, calibrated syrup, a syrup gauge, and a dedicated hand tending the packed-ice freezer. Here its two-pint batch is halved to one pint, the syrup is made in a small saucepan, and a domestic ice-cream machine or shallow metal pan takes the freezer’s place. The larger batch and the hand standing over it are brigade scaffolding and can go. Equal measures of juice and syrup, followed by the 20° balance test, are the dish and must stay. One cook, one stove, one evening.

When it is right, the glace aux groseilles is a deep garnet, keen at first taste, then round and clean as it melts. Balance the base before it freezes. That measurement is the step that matters most, and if the fruit varies, ça se rattrape.