Bombe Santiago

Bombe Santiago (a moulded Cognac ice with pistachio cream) teaches the first law of frozen desserts: cold is not merely storage, it is structure. The shell must be firm enough to hold a clean curve, while the filling must stay supple enough to slice. Its centre is pâte à bombe, an egg-yolk foam cooked with hot syrup, then folded with pure pistachio and whipped cream. Alcohol lowers the freezing point of the outer ice, so measure the Cognac with the same care you give the syrup.

The original recipe assumed a dedicated ice station, prepared bases, and a bombe mould buried in salted broken ice. For one cook, one stove, one evening, the salted-ice packing and brigade quantity are scaffolding, so they go; a 1.5 litre metal mould, a countertop ice-cream machine, and the coldest part of a home freezer do the same work cleanly. What stays is the dish itself: Brandy ice outside, pistachio Bombe-preparation within, each frozen separately enough to keep its character.

Cut it and you should see an ivory ring around a pale pistachio centre, with no gaps and no puddling at the edge. The one step that decides that slice is clothing the mould evenly while the Brandy ice is spreadable but no longer flowing. Get that shell cold and level before the filling goes in; the rest is patient packing.