The tiramisu can be made 1 to 2 days ahead and stored in refrigerator. It will keep for up to 4 days in total and leftovers should be refrigerated immediately. Freeze Note: The tiramisu can be frozen for up to 3 months. Wrap the tiramisu (without hazelnut and cocoa topping) in double layer of plastic wrap and layer of aluminum foil. Thaw overnight in refrigerator and top with nuts and cocoa, as directed in recipe.