2 1/2 cups all purpose flour                                   
2 egg yolks
1/4 tsp salt                                                               
2 egg whites
1 cup butter                                                              
1 cup chopped nuts
1/2 cup sugar                                                           

Stir flour and salt together. Cream butter: add sugar gradually beating between additions. Add egg yolks, mix well. Blend in dry ingredients gradually. Shape dough into 1" balls. Roll in slightly beaten egg whites and then in chopped nuts. Place on a greased cookie sheet: make an indentation in centre of cookies. Bake in moderate oven (350°) 20 to 25 mins. Cool: fill centre with jam.

This recipe yields about 4 dozen cookies.