How to Make It
In a bowl, combine the watermelon, lime zest and minced mint. Refrigerate until chilled.
In a bowl, combine the mascarpone, cream, sugar, lime juice and vanilla. Using an electric mixer, beat at low speed until fluffy. Do not overbeat.
Spoon one-third of the watermelon into Champagne flutes or wineglasses and top with half of the mascarpone. Add another layer of watermelon and mascarpone. Top with a final layer of watermelon, garnish with mint leaves and lime slices and serve.