This can be made "white or dark" depending on the chocolate liqueur you prefer
In a shaker muddle the blackberries
Add ice
Add ingredients (except for the lemon wedge)
Squeeze the juice from the wedge
Shake well and strain into a martini glass
Garnish with blackberries
Ventura Limoncello, Limoncello Truffle Martini https://www.venturalimoncello.com/recipes/ventura-limoncello-crema-cocktails/limoncello-truffle/