Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
     3/4  pound         butter
   1      cup           sugar
   2                    egg yolks
   3      cups          flour
   1      pinch         salt

Preparation:

Cream butter and sugar until fluffy and light. Add egg yolks and beat well. Add flour and salt. Chill dough. Make small balls, put on cookie sheets 2 inches apart. Press with thimble and fill hole with jam. Bake in 375 degree oven for 10-12 minutes.