Tiramisù—literally 'pick me up' or 'lift me up'—is Italy's most famous dessert and one of the most imitated worldwide, a layered confection of espresso-soaked savoiardi (ladyfinger biscuits), a whipped cream of mascarpone, eggs, and sugar, and a dusting of bitter cocoa powder that has achieved global ubiquity while remaining intensely debated in its homeland. The dish is remarkably young—most credible accounts place its invention in the 1960s or 1970s, with the strongest claim belonging to the restaurant Le Beccherie in Treviso (Veneto), though Friuli-Venezia Giulia also stakes a claim. The canonical preparation whips egg yolks with sugar until thick and pale, then folds in mascarpone cheese (the rich, triple-cream cheese native to Lombardy) until smooth. Egg whites are whipped to stiff peaks and gently folded into the mascarpone cream to create a mousse-like lightness. Savoiardi biscuits are dipped quickly—not soaked—in strong espresso (some versions add Marsala, amaretto, or rum, though purists argue for espresso alone or espresso with a splash of Marsala), then arranged in a layer in a rectangular dish. A thick layer of the mascarpone cream follows, then another layer of dipped savoiardi, and a final layer of cream. The assembled tiramisù is refrigerated for at least 6 hours (overnight is better), during which the coffee migrates through the biscuits, the cream sets, and the flavours merge. Bitter cocoa powder—unsweetened, sifted generously—is dusted over the top just before serving. The textural experience should be: the crisp-but-softened biscuit yielding to the creamy mousse, the bitter espresso cutting through the rich mascarpone, and the final note of bitter cocoa on the tongue. No baking, no gelatin, no whipped cream (the lightness comes from the eggs)—the simplicity of the assembly belies the precision required in each component.
Savoiardi dipped quickly (not soaked) in espresso. Mascarpone cream made with egg yolks, sugar, and folded whipped egg whites. Layer: biscuits, cream, biscuits, cream. Refrigerate at least 6 hours. Dust with bitter cocoa before serving. No baking, no gelatin.
The espresso should be strong, room temperature, and unsweetened (or barely sweetened). Dip the savoiardi for 1-2 seconds only—they continue absorbing in the dish. Use the freshest eggs possible (they're consumed essentially raw). The cocoa must be sifted through a fine-mesh sieve. Make it the evening before for the next day's serving.
Over-soaking the savoiardi (turns to mush). Using heavy cream instead of egg whites for lightness. Skipping the egg-white folding (loses the mousse texture). Not refrigerating long enough. Using sweetened cocoa. Substituting generic cream cheese for mascarpone.
Marcella Hazan, Essentials of Classic Italian Cooking; Il Cucchiaio d'Argento