Butter Cookies

Directions

1. 1
   Work flour, butter and salt together.
2. 2
   Add egg yolks and sour cream.
3. 3
   Mix well.
4. 4
   Place in refrigerator at least 4 hours or overnight.
5. 5
   Roll out and cut into squares.
6. 6
   Fill with apricots, prune butter or nuts.
7. 7
   Fold two corners to center.
8. 8
   Press lightly. Brush with beaten egg whites.
9. 9
   Bake in moderate oven at 375° for 10 to 15 minutes.