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["Preheat the oven to 350u00b0F Butter and flour an 8"" x 2"" round cake pan.", "In a small bowl, stir 1 tablespoon of the lemon juice into 1/2 cup of the milk and set aside.", "In another bowl, stir together the flour, poppyseeds, baking soda and salt.", "In another bowl, cream the butter and 1 cup of the granulated sugar.", "Beat in the whole eggs one at a time.", "Beat in 1 teaspoon of the lemon zest (if using) and the lemon extract.", "Alternately beat in the dry ingredients and the lemon juice/ milk mixture.", "Pour the batter into the pan and bake for 35 to 40 minutes, or until a toothpick inserted in the center comes out clean.", "Cool the cake in the pan on a rack for 10 minutes.", "Remove from the pan to cool completely.", "Meanwhile, in a small saucepan, combine the remaining 1/3 cup granulated sugar with the 1 1/2 teaspoon cornstarch and remaining 1/4 cup milk.", "Cook over medium heat, stirring until thickened-- about 3 to 4 minutes.", "In a small bowl, beat the egg yolk.", "Beat in about 2 tablespoons of the hot cornstarch/ milk mixture.", "Stir the warmed yolk mixture into the saucepan and cook over medium heat for 1 to 2 minutes.", "Remove the pan from the heat and stir in the remaining 2 teaspoons lemon juice and 1 teaspoon lemon zest (if using).", "Loosely cover the custard with waxed paper and let cool to room temperature.", "In a mixing bowl, beat the heavy cream until soft peaks form.", "Fold the whipped cream into the cooled lemon custard in the saucepan.", "With a long serrated knife, split the cake in half horizontally.", "Spread all of the lemon filling over the cut side of the bottom layer.", "Top with the remaining layer, cut-side down, and dust the cake with the confectioner's sugar.", "Enjoy!"]