How to Make watermelon ice cream using liquid nitrogen

Bring a little science into your kitchen! For this recipe, you will need: 1/2 cup sugar, 340 grams watermelon juice, 6 grams Versawhip, 2.5 grams xanthan gum, whipped cream dispenser with nitrous oxide chargers, another 1/2 cup sugar, 1 cup heavy cream, 3 egg yolks, 1 quart pureed watermelon, 8 cups liquid nitrogen and 2 cups cubed watermelon.