Also I like to add some lemon juice and lemon zest from some tartness.
You can use any fruit you like but I’d recommend using berries that are in season or combination.
lemon zest and lemon juice of one lemon
-butter and line a 9 inch springform pan with parchment paper
Prepare Cake before putting the filling in
Something like this, but use a springfrom so you can remove the finished cake from the pan easily
Once you have the filling ready(recipe follows) spread it on the top of the cooled sponge cake