Slice half of the strawberries and mash them with a fork. Set aside.
Whip the heavy cream until soft peaks form. Add mascarpone, powdered sugar, and vanilla, then whip until smooth.
Mix brewed coffee in a shallow bowl. Dip ladyfingers briefly into the mixture.
In a dish, layer dipped ladyfingers, mascarpone mixture, and strawberry puree. Repeat layers.
Top with sliced fresh strawberries and dust with cocoa powder. Optionally, add chocolate shavings.
Refrigerate for at least 4 hours, or overnight for best results.
Serve chilled, cut into generous slices.