4 c. flour
1/2 lb. butter
4 egg yolks
1/2 pt. sour cream
Pinch of salt

Mix flour with butter as for pie. Add yolks, one at a time and mix. Add salt and sour cream; mix well. Roll into small balls (about size of a walnut). Refrigerate for 1 hour or more (preferably overnight). Roll balls out and spread with walnut filling. Roll cookie up and shape like a half moon and place on an ungreased cookie sheet. Bake in 375 degree oven until delicately brown (about 15 to 20 minutes). When cool, sprinkle with confectioners' sugar.

FILLING:

4 egg whites
1/2 lb. walnuts
1 c. sugar
1 tsp. cinnamon
Lemon juice from 1 whole lemon

Chop walnuts. Add rest of ingredients mix well. Do not beat whites.