In the bowl of an electric mixer fitted with the whisk attachment, whisk the mascarpone, cream, and sugar on low to combine, then increase the speed to whip it into soft or semi-stiff peaks (as you like, basically, just don’t overwhip it).
Trifle assembly
You will need 6 wide-rimmed Mason jars or wide-rimmed glasses
Fit a layer of cake in the bottom of each jar or glass.
Sprinkle the cake with a teaspoon or so of booze.
Top with a spoonful or two of fruits.
Add a scoop of mascarpone cream.
Repeat steps 1 to 4 so that you have two layers of everything. Don’t be shy to press down a little.
Top the final cream layer with a pretty berry. Refrigerate until ready to serve.