1 1/2 ounces gin
3/4 ounce lemon juice
1/2 ounce simple syrup
3/4 ounce crème de mure
Garnish: Lemon slice, blackberries
Fill a rocks glass with crushed ice and add gin, lemon juice, and simple syrup. Stir to combine and chill. Carefully drizzle crème de mure on top.
Source: Dick Bradsell

One of the early "new modern classic" cocktails to come out of London, from famed bartender Dick Bradsell.