Take one bottle of traditionally illicit Antrim poitin, matured three months to six, and into it macerate some fresh seasonal blueberries for nine months.
Serve two fingers of the resulting fruit poitin in a Slim Jim with fresh mint leaves, muddled.
Add ice to the top, then dilute with quinine tonic water to the brim.
Citrus slice optional.
The best summer cocktail ever.