Lemon Soufflé There's something unforgettable about the soufflé-a magical blending of eggs, air, and acid. 2 tbsp. unsalted butter, plus more for greasing molds 1⁄ 2 cup sugar, plus more for molds 8 eggs, separated, plus 1 egg white 1⁄ 2 cup fresh lemon juice Confectioners' sugar, to garnish Heat oven to 375°.