For best results, let the tiramisu rest in the refrigerator for at least 4 hours, or preferably overnight.
If you prefer a stronger coffee flavor, increase the amount of sugar in the espresso dip or use a stronger brew.
Mascarpone provides the traditional creamy texture; if using cream cheese, ensure it is softened for easier whipping.
Ensure all equipment for whipping egg whites is completely clean and grease-free for best volume.