Summer pitcher cocktail

Ingredients

• 1 (750 milliliter) bottle of dry sparkling rosé (chilled)
• 0.5 to 0.75 cup Cassis (to taste)
• 1 to 2 tablespoons simple syrup (to taste)
• 1 cup (most of a can) of club soda or seltzer
• 2 cups frozen mixed berries, straight from the freezer

Notes

I prefer the larger quantity of Cassis and tend to omit the simple syrup - but it really depends on the wine and how dry it is.