1/2 c. unsalted butter
1/4 c. brown sugar
1 egg, separated
1 c. flour
1 c. chopped walnuts
Jar plum preserves

Cream butter and sugar. Add egg yolk and beat. Add flour. Blend and form into balls. Dip balls in slightly beaten egg white. Roll in walnuts. press finger into center of ball to form indentation. Bake at 350 degrees for 8 minutes. Remove from oven and fill holes with plum preserves. Return to oven for 10 minutes. Makes 2 dozen cookies.