Cut kiwifruit into chunks. Process fruit chunks and lemonade concentrate in a food processor until smooth, stopping to scrape down sides.
Pour mixture through a wire-mesh strainer into a pitcher, discarding solids. Stir in lemon-lime soft drink just before serving.
Strawberry-Kiwi-Lemonade Spritzer: Process 2 cups fresh strawberries; 4 kiwifruit, peeled and cut into chunks; and 1 (12-ounce) can frozen lemonade concentrate, undiluted and thawed, in a food processor until smooth, stopping to scrape down sides. Proceed as directed.
