Baked Alaska Saint Pierre

Name: Baked Alaska Saint Pierre
Ingredients: ⅓ cup sweet orange marmalade; 1 qt superpremium vanilla ice cream, softened slightly; 1 pint orange sorbet, softened slightly; ½ cup cake flour (not self-rising); ¼ teaspoon salt; 3 large eggs at room temperature for 30 minutes; ½ cup sugar; 2 teaspoons finely grated fresh orange zest; 2 teaspoons Grand Marnier; 3 tablespoons unsalted butter, melted and cooled; 7 large egg whites (egg yolks reserved for another purpose); ¼ teaspoon cream of tartar; 1¼ cups sugar; 1 teaspoon vanilla extract; 1 eggshell half, cleaned; 2 tablespoons Grand Marnier; Special Equipment: 2 (8- by 2-inch) round cake pans; a 9- by 2-inch round cake pan; a round cake pan or plate at least 10 inches in diameter