Lightly mix together the blackberries, blueberries, raspberries and strawberries in a large bowl. Portion the berries into 6 small dessert bowls or glasses. Add a shot of limoncello to each. Refrigerate for at least 30 minutes and up to 4 hours to allow the berries to macerate in the liquid.
Just before serving, garnish with basil.
Recipe courtesy of Valerie Bertinelli