Watermelon Prosecco Punch Recipe
Active time: 30 minutes
Total time: 2 hours 30 minutes (including freezing time)
Line a large rimmed baking sheet with parchment paper. Remove and discard watermelon rind, and cut flesh to make 24 (1") cubes. Arrange watermelon cubes and blackberries in a single layer on prepared baking sheet and freeze until completely solid, about 2 hours.
When ready to serve, in a 2-quart pitcher, stir together vodka, St-Germain and lime juice. Add frozen fruit and Prosecco, and stir gently to combine. Ladle or pour into cocktail glasses, garnish with lime slices and mint and serve immediately.