Ingredient:
2 cups cold water
1 can (6 oz) frozen orange juice concentrate, thawed
3/4 cup frozen (thawed) grapefruit juice concentrate (from 12-oz can)
1 bottle (1 liter) sparkling water, chilled
Orange slices, if desired
Fresh mint leaves, if desired

Method:
In large pitcher, mix cold water, orange juice concentrate, grapefruit juice concentrate and sparkling water.

Serve spritzers over ice. Garnish each serving with orange slice and mint leaf.