Strawberry-Rhubarb Punch

Heat rhubarb, water, sliced strawberries, lemonade concentrate and sugar in large saucepan over high heat to boiling; reduce heat. Simmer covered until rhubarb is very soft, 10 to 15 minutes. Strain mixture, pressing fruits with back of spoon to extract liquid; discard pulp. Refrigerate covered until cold.

Pour syrup over ice cubes in punch bowl. Add carbonated beverage. Garnish with lemon slices and strawberries.