1/2 c. butter
1/2 c. sugar
1 egg yolk, slightly beaten
1 c. flour
1/2 tsp. salt
1/2 tsp. vanilla
1 egg white
Chopped walnuts
Raspberry preserves

Cream butter and sugar until light. Add egg yolk and vanilla; mix well. Add flour sifted with salt. Mix. Roll dough into small balls, dip in unbeaten egg white and then roll in finely chopped walnuts. Place on buttered baking sheet and press down center of each ball with a thimble. Bake in 325 degree oven for 5 minutes. Remove and press down again with thimble, return to oven for 10 to 15 minutes. Remove from oven and fill indentation with preserves while still warm. Frost with sour cream icing.