Step by step

Beat the whites until stiff.

Tips
Make this dessert when strawberries are in season; out-of-season strawberries cost much more and will either be a from a greenhouse or come from abroad.
Trivia
To get an even fresher and more delicate result, strawberry tiramisù can also be made with ‘robiola’ cheese instead of mascarpone and substituting plain yoghurt for the cream.