Hungarian Butter Horn Cookies

Ingredients
4 c. flour
1/2 tsp. salt
1 tsp. vanilla
1 sm. square yeast or 1 pkg. dry yeast
1 1/2 c. butter
1/2 c. sour cream
3 egg yolks, beaten (save egg whites)
1 c. sugar
1/4 lb. walnuts, finely chopped

Preparation
Sift flour, add salt. Crumble or add yeast into flour, cut butter into flour mixture. Add beaten egg yolks. Add sour cream and vanilla.

FILLING:
Beat egg whites until stiff. Add 1 cup granulated sugar gradually. Add finely chopped walnuts. Add 1 teaspoon vanilla. Dredge board with powdered sugar instead of flour.
Divide dough into 4 portions, roll out each to the size of a pie tin. Cut into 8 wedges. Spread 1 teaspoon of filling on each wedge and roll towards center. Bake immediately. Put on ungreased pans. Bake at 400 degrees until light brown.