Starburst Sugar-Free Gelatin is perfect for warm summer days or whenever you or your kiddos need a sweet treat. Starburst Sugar-Free Cherry Gelatin is refreshing, sugar-free, and fat-free, with only 5 calories per serving. Perfect for after-school snacks, pool days, or picnics, this cherry flavored snack gelatin is easy to prepare.. Add boiling water, stir in the gelatin mix until completely dissolved, add cold water, and refrigerate until firm and ready to eat. The whole family will love Starburst Gelatin Mix!