Frozen Watermelon Tart

Name: Frozen Watermelon Tart
Ingredients: 4 cups (8 ounces) vanilla wafer cookies; 2 tablespoons granulated sugar; 2 teaspoons chile-lime seasoning, such as Tajín; Pinch kosher salt; 6 tablespoons melted coconut oil; 1/2 small seedless watermelon; 1/4 cup fresh lime juice; 1/2 cup granulated sugar; 1/2 teaspoon kosher salt; 4 large egg yolks; 2 tablespoons cornstarch; 2 tablespoons coconut oil; 1 cup heavy cream; 3 tablespoons confectioners’ sugar; Chile-lime seasoning, such as Tajín; Flaky sea salt