Plum Ice

Glace aux prunes teaches the central truth of every fruit glace: sweetness is structure. At 20° Baumé, the base freezes fine-grained and softly scoopable; too little sugar turns it stony, while too much leaves it slack. Plum acidity swings hard from basket to basket, so taste first, then let the gauge settle the texture.

The book assumed a pastry section with a syrup gauge always ready, a freezing canister packed with salted ice, and enough hands to keep it turning. A handheld refractometer and a countertop ice cream machine do the same work at home. The staff and heavy canister are scaffolding and can go; measured density and quick freezing are the dish and must stay. The linked formula lands neatly in one modern canister, about a quart for the table. One cook, one stove, one evening, with the freezer taking the last watch.

Combine the plum, syrup, and lemon completely before you judge either sweetness or density. That final calibration to 20° Baumé is the step that matters most, and you must make it before the base meets the cold.