1 pkg. dry yeast
1/4 c. warm water
1 1/3 c. butter, softened
3 1/2 c. flour
4 eggs, separated
1/2 c. sour cream
1 3/4 c. chopped walnuts
1 1/4 c. sugar
1 tbsp. cinnamon
1 c. apricot jam

Soften yeast in warm water. Combine butter and flour in a mixing bowl, blending at low until mixture resembles crumbs. Add egg yolks, sour cream and yeast. Blend at low until dough forms. Shape into ball. Divide into three. Roll each on a floured surface to a 13"x9" rectangle. Place one on bottom of greased 13"x9" pan. Combine walnuts, sugar, cinnamon; sprinkle over dough in pan. Top with second rectangle. Spread with jam. Top with remaining rectangle. Bake at 350 degrees for 50 to 55 minutes.