Place the mixed berries in a bowl and gently mash some of them with a fork to release their juices, creating a vibrant, slightly squished berry mixture.
Bread or break the ladyfingers or sponge cake into bite-sized pieces and layer them evenly at the bottom of your serving dish.
Pour the vanilla custard or pudding over the cake layer, allowing it to soak in and soften the sponge, creating a creamy base.
Spread the mashed and whole berries over the soaked cake, distributing them evenly while pressing lightly to encourage juice release.
In a chilled bowl, whip the heavy cream with sugar and lemon zest until soft peaks form—this will take about 3-4 minutes at medium speed.
Gently fold the whipped cream into the berry layer, spreading it evenly to cover the berries and create a fluffy top layer.
Finish by garnishing with fresh mint or basil leaves for a bright, herbal touch, and serve immediately or chill for a couple of hours to meld flavors.