Watermelon Fireball Shots Spicy and sweet, soaked watermelon balls in Fireball really bring the party! Ingredients: Fireball whisky or other cinnamon flavor whiskey Watermelon balls Directions: 1. Soak watermelon balls in Fireball at least one hour, up to 24 hours. 2. Place a watermelon ball in a shotglass and pour shot over.