Lemon Chocolate Pie Recipe

Name: Lemon Chocolate Pie Recipe
Ingredients: For the Filling; 5 large egg yolks; 1 1/4 cups sugar; 1/3 cups cornstarch; 1/3 cups cold water; 1 1/2 cups very hot water; 2 tablespoons melted unsalted butter; 1 tablespoon lemon zest; 1/2 cup fresh juice from 6 to 8 lemons; 2 teaspoons vanilla extract; For the Crust; 2 unbaked pie crusts (I used the Food Lab's Easy Pie Crust); 1 egg white; For the Chocolate Topping; 5 ounces 72% cacao chocolate; 3 tablespoons unsalted butter; 1 tablespoon dark corn syrup