1: Fill a glass 3/4 full with ice (ours is 16 oz. for reference).

2: Pour cold brew to just about here.

3: Fill with tonic water to just about here.

4: Fill with grapefruit juice to just about here.

5: Make mint simple syrup (this will be more than you need for one drink; save it for future drinks or add it to a cocktail): 3 tbsp. sugar, 3 tbsp. water, 5-7 mint leaves. Heat all three until sugar dissolves and and set aside for a few minutes.

6: Give it all a swirl, get fancy with a mint leaf or just get in there and enjoy.