1 cup butter or margarine
1-1/2 teaspoons vanilla extract
2 cups sugar
4 eggs
1-3/4 cups flour
1/2 teaspoon salt
2 cups coarsely chopped nuts
2 squares unsweetened chocolate, melted and cooled
Your favorite chocolate frosting

Cream first three ingredients together until light and fluffy. Add eggs, one at a time beating well after each. Add flour and salt and mix until blended. Stir in nuts. Divide batter in half and add chocolate to one half. Drop batter alternately by heaping teaspoonfuls into greased 13 x 9 inch pan lined on bottom with waxed paper. Press down with spoon to smooth top and run knife through batter several times to marbleize. Bake in moderate oven (350) about 25 minutes.