Instructions

1. 1

   Muddle the fruit and mint. Drop the blackberries, mint leaves, and lime juice into a sturdy glass. Press and twist with a muddler or the back of a wooden spoon until the blackberries release their juice and the mint is bruised and fragrant — you want the berries broken down but the mint just lightly crushed, not shredded into bits.

2. 2

   Add the sweet and the spirit. Pour in the simple syrup and white rum. Give it a quick stir to combine everything with the muddled fruit.

3. 3

   Fill and top. Pack the glass with ice, then pour club soda over the top. Stir gently — just two or three turns — so the berry color streaks up through the drink without losing all the fizz.

4. 4

   Garnish and serve. Thread a few extra blackberries onto a cocktail pick or drop them in, tuck in a sprig of mint, and add a lime wheel to the rim. Serve right away while it's cold and bubbly.