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50 g fresh blackberries
2 tbs sugar
12 cl gin
6 cl lime juice (from 2 juicy limes)
club soda
2 sprigs sweet basil or 2 thin lime wedges (for garnish)
Purée blackberries and sugar in a blender until as liquefied as possible. Strain purée through a fine-mesh sieve or tea strainer into two tall or collins-style glasses; discard seeds in sieve. Divide gin and lime juice between glasses and stir to combine.
Add ice to glasses then top each with soda and a sprig of basil or wedge of lime.