Volcano Surprise with Lemon Mousseline Cake Recipe | Epicurious

Ingredients

• 6 large eggs, separated
• 1/2 cup granulated sugar
• 2 teaspoons grated lemon rind
• 1 teaspoon vanilla extract
• 1/2 cup potato starch (3 to 3 1/2 ounces)
• 1/4 cup all-purpose flour
• 1 tablespoon unsalted butter (for buttering pan and platter)
• 1 quart vanilla ice cream
• 3 tablespoons cognac
• 8 egg whites from large eggs
• 4 egg yolks, beaten with a fork
• 1/2 teaspoon vanilla extract
• 1 cup granulated sugar
• Hollowed-out shell of 1/2 lemon
• 1 tablespoon confectioners' sugar, for dusting the cake
• 1/3 cup warm cognac