Securely attach the grill plate to the top of your grill and the baking pan to the bottom of your grill. Preheat grill to 325°F.
Spread the frozen fruit over bottom of baking pan.
Mix cake mix and seltzer water in medium bowl; pour over fruit.
Close grill top and bake 20 minutes or until cake is golden brown.
Substitute white cake mix for yellow cake mix.
Substitute seltzer for lemon lime soda.