1/2 c. butter
1/2 c. sugar
1 egg yolk, slightly beaten (save egg white)
1 c. flour
1/2 tsp. salt
1/2 tsp. vanilla
1/2 c. finely chopped nuts

Cream butter and sugar until fluffy. Add egg yolk and vanilla; mix well. Add sifted flour and salt; mix. Roll dough in small balls. Dip in unbeaten egg white. Roll balls in finely chopped nuts.

Place on buttered baking sheet and press down center of each and bake 5 minutes. Remove and press again. Return to oven for about 10-15 minutes. Remove from oven and fill indentations with preserves while still warm.