Process first 3 ingredients in a blender until smooth, stopping to scrape down sides.
Pour raspberry mixture through a wire-mesh strainer into a large pitcher, discarding seeds; stir in club soda. Serve over ice.
Fizzy Strawberry Lemonade: Substitute 1 (10-ounce) package frozen strawberries, partially thawed, for frozen raspberries. Prepare recipe as directed. Prep: 10 min.
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