- 1 box round vanilla wafers (12 oz.), finely ground
- 1 stick unsalted butter, melted
- 5 cups watermelon juice (from about 1/2 of a large watermelon,cut into cubes, blend in blender and strain)
- 1/2 teaspoon lemon zest (from 1 lemon)
- 1/2 cup fresh lemon juice (from 2 large lemons)
- 1/2 cup sugar
- 1/2 cup heavy cream
- 4 envelopes of unflavored gelatin (you can find these unflavored in the same section as the flavored)
- 1/4 cup confectioners’ sugar or 1 cup whipped cream, for garnish
Preheat the oven to 350 degrees F. Line a 13-by-9-inch baking pan with foil, leaving a 2-inch overhang on the long sides of the pan. Spray the foil with cooking spray.
Mix the melted butter into the finely ground vanilla wafers and add 2 Tablespoons of water. Mix well and press the crumbs onto the bottom of the prepared pan, forming a crust. Bake the crust for 20 minutes and allow to cool.
Set aside 2 cups of the watermelon juice in a small bowl. In a large bowl, combine the remaining 3 cups of watermelon juice with the lemon zest, lemon juice, sugar and heavy cream.
Sprinkle the gelatin over the reserved 2 cups of watermelon juice. Allow to sit for 2 minutes so that gelatin can dissolve and begin to absorb liquid, or "bloom." After the gelatin blooms, heat it in the microwave for 2 minutes on high, or heat gently in a small pot over low heat on the stove top, until the gelatin has completely melted into the juice and the liquid is smooth.
Add the watermelon juice with the melted gelatin to the larger bowl of juice. Stir to combine. Gently pour the mixture over the prepared crust and place in the freezer for 2 hours or until the mixture is firm. (Alternately, place the pan in the refrigerator and allow to set for 3 to 4 hours.)