Cream butter, sugar and cream cheese together until light and fluffy. Add egg yolk and beat well. In a separate bowl, combine flour, walnuts, salt and lemon rind, then add to the butter-sugar mixture ...

Grease and flour bottom of baking pan and sides of 15 X 10 X 2 inch jelly roll pan; line bottom of pan with waxed paper. Beat eggs at high speed with electric mixer for 5 min at high rate of speed ...