1 (10-ounce) package frozen raspberries, thawed, with juices
1 (3/4 inch) piece fresh ginger, peeled
2 tablespoons granular sugar substitute
1 (2-liter) bottle seltzer water, chilled
Ice cubes (optional)
To make the drink base: Pure raspberries and their juices, ginger, and sugar substitute in a blender. Strain the mixture through a fine-mesh sieve. For each drink, place 4 teaspoons of the base in an 8-ounce glass. Add cup seltzer and stir rapidly. Add a few ice cubes, if desired, and stir again. Serve.
Nutrition at a Glance
Per drink: 60 calories, 4.5 g fat, 0.5 g saturated fat, 4 g protein, 2 g carbohydrate, 0 g fiber, 25 mg sodium
Make-Ahead: Raspberry-ginger drink base can be made up to 1 day ahead and refrigerated in a covered container until ready to use. Add seltzer water to drinks individually, just before serving.