Semifreddo ('half-cold') is Italy's frozen mousse dessert—a light, airy, frozen preparation made by folding whipped cream and/or Italian meringue into a flavoured base (custard, chocolate, fruit purée, nut paste), freezing it in a mould without churning, and serving it sliced like a terrine at a temperature that is cold but not rock-hard, producing a dessert with the lightness of mousse and the drama of frozen presentation. Semifreddo is the Italian restaurant dessert par excellence—it requires no ice cream machine, can be made entirely in advance, unmoulds beautifully, and slices into elegant portions. The texture is key: because the base is aerated (folded whipped cream and/or meringue provide millions of tiny air bubbles), semifreddo freezes to a soft, mousse-like consistency rather than the dense hardness of gelato. It should be eaten at about -8 to -10°C—cold enough to hold its shape when sliced but soft enough to yield immediately to a spoon. Classic flavours include: al torroncino (nougat), al caffè (espresso), al cioccolato (chocolate), alla nocciola (hazelnut), ai frutti di bosco (mixed berries), and allo zabaglione (Marsala custard). The structure follows a consistent method: make a flavoured base (custard, melted chocolate, fruit purée), fold in whipped cream (beaten to soft peaks), optionally fold in Italian meringue (for extra lightness and stability), pour into a plastic-lined loaf tin or mould, freeze for at least 6 hours, unmould, slice, and serve.
Flavoured base folded with whipped cream and/or Italian meringue. Freeze in a mould without churning. Slice and serve at semi-frozen temperature. Light, airy, mousse-like texture. No ice cream machine required. Can be made entirely in advance.
Line the mould with plastic wrap, leaving generous overhang for easy unmoulding. Italian meringue (sugar syrup poured into whipping egg whites) gives a more stable result than just whipped cream. Remove from freezer 10-15 minutes before serving for the ideal texture. A hot knife (dipped in hot water, wiped dry) gives clean slices. Semifreddo keeps for up to 2 weeks in the freezer if well-wrapped.
Over-whipping the cream (soft peaks, not stiff—stiff cream won't fold smoothly). Not folding gently enough (deflates the air that creates the texture). Serving too cold (should be slightly softened, not rock-hard). Using a flavour base that's too warm when folding (melts the cream). Not lining the mould (impossible to unmould cleanly without plastic wrap).
Marcella Hazan, Essentials of Classic Italian Cooking; Academia Barilla, Italian Desserts