Berry Spritzer

Martha prepares a patriotic berry spritzer cocktail.

Ingredients

Place blackberries, raspberries, simple syrup, grape juice, and lemon juice in the jar of a blender; puree until smooth. Strain mixture through a fine mesh sieve, discarding solids.
Fill 8 Collins glasses with ice, if using. Divide mixture evenly between glasses; top with seltzer or wine and serve immediately garnished with fruit skewers, if desired.