Orange Gold Cake With Orange Butter Frosting
["3/4 c. soft butter", "1 1/4 c. sugar", "5 egg yolks (egg substitute can be used)", "grated rind of 1 orange", "1/3 c. orange juice", "2 3/4 c. flour", "2 3/4 tsp. baking powder", "1/2 tsp. salt", "2/3 c. milk"]
["Cream butter and sugar.", "Add yolks, one at a time, beating constantly.", "Beat in orange rind and juice.", "Sift together dry ingredients; add alternately with milk, beating until smooth. Pour into greased and floured spring-form pan.", "Bake at 375\u00b0 for about 1 hour, until done.", "Cool; remove from pan."]
["butter", "sugar", "egg yolks", "orange", "orange juice", "flour", "baking powder", "salt", "milk"]