1 cup halved red or green seedless grapes
1/2 cup blueberries
12 mint leaves
1 lemon, cut into 8 wedges
1 liter club soda
In a large reusable plastic bag, combine the grapes and blueberries and freeze overnight.
Have 4 glasses set and ready. In a beverage shaker, combine the mint leaves, frozen blueberries and grapes, and 4 of the lemon wedges. Grind together with a muddler or pestle until combined.
Divide the fruit mixture evenly among the 4 glasses. Top with crushed ice and club soda, garnish with a lemon wedge, and chill out.