Step 1

In a cocktail shaker combine sugar, basil leaves, lime, blackberries, and bourbon. Muddle to break up the berries, basil, and lime, and to dissolve the sugar.

Step 2

Add a generous amount of ice, shake to chill and combine.

Step 3

Fill an old fashioned glass ice. Strain cocktail over ice, top off with club soda. Garnish with additional basil, berries, and lime if desired. Enjoy immediately.