Start by washing the strawberries. Remove the stems and blend them into a smooth puree using a blender or food processor. You want a silky consistency, so take your time to blend thoroughly.
Next, transfer the strawberry puree to a saucepan. Add the sugar and lemon juice. Bring the mixture to a gentle boil. As it heats, you’ll notice the colors deepening and the aroma filling your kitchen.
Simmer for two to three minutes, stirring occasionally. This step helps to concentrate the flavors. Once it’s done, take it off the heat and let it cool completely. The cooling is crucial as it’ll prevent the ladyfingers from becoming mushy.
For the cream, combine the cold mascarpone and cold heavy cream in a large mixing bowl. Add the powdered sugar and vanilla extract (if using) and beat with a mixer until fluffy. Initially, the mixture will be liquid, but with consistent beating, it will thicken and become airy.
Now it’s time for assembly. Dip the ladyfingers in the cooled strawberry sauce, ensuring they are well-coated but not soggy. Place them in a single layer in a baking dish (25×20 cm or 10×8 inches).
Spread a generous layer of cream over the dipped ladyfingers. Make sure to smooth it out evenly, providing a rich base for the next layer.
Repeat the soaking process with another layer of ladyfingers, placing them on top of the cream. This layering technique is what makes Strawberry Tiramisu so indulgent.
Finish with a thin layer of cream on top. You can use a piping bag to decorate with the remaining cream, creating beautiful swirls or patterns.
Cover the dish and refrigerate for a few hours, allowing the flavors to meld and the dessert to set perfectly. You can prepare this a day in advance for maximum flavor.
Just before serving, decorate with fresh strawberries on top. This last-minute touch adds freshness and enhances the visual appeal.