Preheat oven to 350 degrees. Grease and flour two 8 inch round pans. Mix together the dry ingredientsSet aside. In a large bowl, cream together the butter and sugar until light and fluffy. Add lemon juice & zest to the milk.Beat in the eggs one at a time,stir in vanilla. Beat in the flour mixture alternately with milk, mixing just until incorporated. Pour batter into pans. Bake in the preheated oven for 30 minutes, or until a toothpick inserted into the center of the cake comes out clean. Allow to cool in pans on wire racks for 10 minutes. Then invert onto wire racks to cool completely.

To make filling: In medium saucepan, mix together 1 tablespoon lemon zest, 1/2 cup lemon juice and 1 tablespoon cornstarch until smooth. Mix in 6 tablespoons butter and 3/4 cup sugar, and bring mixture to boil over medium heat. Boil for one minute, stirring constantly. In small bowl, with a wire whisk, beat egg yolks until smooth. Whisk in a small amount of the hot lemon mixture. Pour the egg mixture into the sauce pan, beating the hot lemon mixture rapidly. Reduce heat to low; cook, stirring constantly, 5 minutes, or until thick (not to boil). Pour mixture into medium bowl. Press plastic wrap onto surface to keep skin from forming as it cools. Cool to room temperature. Refrigerate 3 hours.

To make frosting: In large bowl, beat confectioners’ sugar, 1/2 cup butter, 2 tablespoons lemon juice and 1 teaspoon lemon zest until smooth, and increase speed and continue to beat until light and fluffy.((add milk 1 tablespoon at a time to thin frosting if needed))

To assemble: With long serrated knife, split each cake layer in half horizontally, making 4 layers. Place 1 layer, cut side up, on a serving plate. Spread with half of the lemon filling. Top with another layer, and spread with 1/2 cup frosting. Add third layer, and spread with remaining half of the lemon filling. Press on final cake layer, and frost top and sides of cake with remaining frosting.Decorate sides of cake with nuts if desired. Refrigerate cake until serving time.