Meringue and Sweet Butter Cake Recipe

Name: Meringue and Sweet Butter Cake Recipe
Ingredients: For the Meringue Layers:; 2 tablespoons unsalted butter; 1/2 cup confectioners’ sugar; 2 cups (about 14 ounces) granulated sugar; 4 teaspoons cornstarch; 6 large egg whites, at room temperature; 2 teaspoons white vinegar; 1/4 teaspoon salt; 2 teaspoons pure vanilla extract; For the Sweet Butter and Assembly:; 8 tablespoons (4 ounces) unsalted butter, at room temperature; 1/2 cup plus 2 tablespoons confectioners’ sugar; 1 large egg yolk; 1 teaspoon pure vanilla extract; 1/8 teaspoon salt