Watermelon-Berry Sparkler

Puree watermelon and raspberries in a blender. Scrape mixture through a fine sieve into a bowl; discard seeds. Stir sugar into puree (adding more if too tart). Puree can be made up to 1 day ahead and refrigerated.

For sparklers, pour 2 tbsp puree into each champagne glass and top with 4 oz cold brut champagne or prosecco. For a nonalcoholic version, use club soda or seltzer instead.