Step 1: In a separate container, muddle 4 of the blackberries until you have about a tablespoon of the juice.
Step 2: in an old fashioned glass with ice, combine the gin, sugar, and blackberry juice. Top off with tonic water and stir. Garnish with the remaining blackberry and a slice of lime.
Step 4: refreshing, summery drink that’s not too sweet. Love ’em!