Muddle the blackberries and basil leaves in the bottom of a copper mug for about 20 seconds, until the berries break down and the basil looks bruised.

Add the lime juice directly over the muddled fruit.

Fill the mug with ice.

Top with the kombucha, pouring slowly to keep as much carbonation as possible.

Stir once from the bottom to lift the muddled fruit through the drink.

Garnish with the extra blackberries on a pick and a fresh basil leaf, slapped once to release its oil.