Zabaglione — egg yolks beaten with Marsala over a double boiler until they reach a foamy, custard-like consistency — is the foundational egg foam preparation of the Italian kitchen. The technique demonstrates the principle of controlled protein denaturation through gentle, indirect heat: the yolk proteins denature progressively, trapping air and producing a foam that sets when hot and remains stable briefly when served. The simultaneous beating and heating is the mechanism — beating incorporates air; heat denatures the protein partially; the partially denatured protein stabilises the air bubbles.
- **The temperature:** The bowl must not touch the simmering water beneath — the steam heats the bowl to 65–70°C maximum. Above 70°C the yolk proteins coagulate rather than foam - **The beating:** Continuous and vigorous throughout — stopping allows the yolk proteins near the bowl bottom to coagulate from accumulated heat - **The Marsala:** Dry Marsala — [VERIFY] Hazan's specification - **The ratio:** 1 egg yolk + 1 tablespoon Marsala + 1 tablespoon sugar per serving [VERIFY] - **The serve:** Immediately — zabaglione begins to deflate within minutes. It is the most time-sensitive dessert in the Italian canon
Hazan