In a large mixing bowl, sift together the all-purpose flour, cornstarch, cocoa powder, sugar, and salt. In a separate bowl, whisk the eggs, cold milk, and vanilla extract until smooth. Gradually combine the wet and dry ingredients, stirring to avoid lumps. Finally, whisk in the melted butter until smooth. Let the batter rest for 20–30 minutes or ideally overnight in the refrigerator for a silky texture.

Heat a nonstick skillet over medium heat. Once hot, lightly grease with butter or oil, and pour about 60 ml of batter into the pan, swirling to create a thin layer. Cook for 1–2 minutes or until the edges lift slightly and the surface is set. Carefully flip the crêpe and cook for an additional 30 seconds. Transfer to a plate and repeat the process until all the batter is cooked, stacking the crêpes as you go.

In a heatproof bowl over a Bain-Marie, whisk the egg yolks and sugar until thickened and pale, about 8–10 minutes. Remove from heat and let cool slightly. In a separate bowl, whip the heavy cream until stiff peaks form, then fold in the mascarpone cheese until combined. Carefully add the cooled egg mixture and coffee liqueur, folding gently to maintain airiness. Set aside your rich tiramisu cream.

On a lined sheet pan, start by overlapping the cooled crêpes slightly to form a base. Spoon a generous layer of the tiramisu cream over the crêpes, followed by a few coffee biscuits soaked in coffee liqueur. Repeat these layers, adding more crêpes and cream until finished, ending with a layer of tiramisu cream on top for a beautiful finish.

Starting from one end, carefully roll the layered crêpes into a tight log, ensuring the filling stays inside. Wrap the rolled crêpe cake tightly in plastic wrap, securing the ends. Refrigerate it for at least 4 hours or overnight to allow the flavors to meld and the cake to firm up, making it easier to slice.

Once chilled and set, unwrap your Tiramisu Crêpes Cake Roll and dust the top with cocoa powder for an elegant finish. Use a sharp knife to slice into beautiful rounds, revealing the stunning layers. Serve immediately, perhaps with a side of fresh berries for an extra touch of color and flavor.