Slow Ramble

Chill the Old Fashioned Glass glass by filling it with ice water and setting it aside.

In a cocktail shaker, combine the gin, sloe gin, freshly squeezed lemon juice, and grapefruit juice.

Add the blackberry liqueur and a dash of lemon bitters to the shaker.

Fill the shaker with ice and shake vigorously until well chilled.

Discard the ice water from the Old Fashioned Glass and double strain the mixture into the glass.

Garnish with a fresh blackberry to finish.