1-First Step: Mise en Place Brew 1 1/2 cups strong espresso and let it cool to room temperature. Mix in 2 tbsp Marsala wine or rum if using. Separate 3 large eggs: yolks in one bowl, whites in another. Let 250g mascarpone sit out to soften. Measure 1/2 cup sugar and have 24 savoiardi ladyfingers ready. Dusting cocoa goes nearby. This setup takes 10 minutes and keeps things smooth.

2-Second Step: Make the Sabayon Place egg yolks, 1/2 cup sugar, and 1 tbsp Marsala in a heatproof bowl over simmering water (double boiler). Whisk constantly for 5-7 minutes until thickened and pale, reaching 160°F (71°C). It triples in volume like a custard. Remove from heat and cool for 10 minutes, stirring occasionally. This cooks the eggs safely for that authentic creamy base.

3-Third Step: Prepare Mascarpone Cream Beat softened mascarpone into cooled sabayon until smooth, about 2 minutes with a mixer. In a clean bowl, whip egg whites to stiff peaks (3-4 minutes). Gently fold whites into mascarpone mixture in thirds using a spatula. Keep it light; overmixing deflates air. Your cream is now ready, fluffy and stable.

4-Fourth Step: Dip and Layer Ladyfingers Pour coffee mixture into a shallow dish. Dip each ladyfinger 1-2 seconds per side; too long makes soggy mess. Lay half (12) in bottom of 8×8 dish, trimming to fit. Spread half the cream evenly over them. Repeat: dip remaining 12 ladyfingers, layer on top, then cover with rest of cream. Smooth surface. Takes 5-7 minutes.

5-Fifth Step: Chill and Finish Cover dish with plastic wrap and refrigerate 4-24 hours. Flavors deepen overnight. Before serving, sift unsweetened cocoa powder generously over top. Slice with serrated knife for clean cuts. Serve chilled. Yields 8-10 portions, perfect for sharing.