Fill glass with crushed ice.
Build gin, lemon juice and simple syrup over.
Stir, and then pour blackberry liqueur over in a circular fashion to create marbling effect.
Garnish with two blackberries and lemon slice.

Serve: Old-Fashioned glass

- 4 cl Gin
- 1.5 cl lemon juice
- 1 cl Sugar syrup
- 1.5 cl Creme de Mure