FOR THE CAKE:.
Preheat oven to 350 degrees.
Beat eggs thoroughly with electric mixer. Gradually ad sugar. Beat until fluffy. Sift flour 2 times. Add, beating thoroughly. Place Milk and butter in small saucepan and let come to a boil. Add immediately to flour mixture and beat until cool (8-10 minutes). Batter will be quite thin. Sift in remaining 1 tablespoon flour, baking powder and salt. Add floverings. Beat 1 minute more. Pour (about 1 cup batter per pan) into 3 well-greased and floured 9 inch cake pans*. Bake approximately 30 minutes or until tester comes out clean.
* I get sneaky here cause I love Kittencal's pan release, #78579.
FOR THE FILLING:.
Mix dry ingredients. Beat egg yolks with water and juice. Add dry ingredients. Blend well. Cook in double boiler until clear. Remove from heat. Add rind and butter. Spread on layers and stack.
Boil sugar and water until syrup forms thread about 3 inches long when dropped from a spoon, or cook until syrup has reached 238 degrees on candy thermometer. Beat egg whites with salt until stiff. While very hot, pour syrup in fine stream over egg whites. Beat until misture is creamy and reaches spreading consistency. Add cream of tarter and vanilla. Spread on sides and top of cake.