Potica (croatian Nut Roll)

Stir yeast into water. Mix butter, milk, sugar, and salt. Add egg yolks, yeast mixture and 2 cup flour. Mix thoroughly. Add remaining flour and turn dough out on a floured surface. Knead until smooth, elastic and does not stick to surface. Place in greased bowl and let rise 1 hour. After it has risen, divide into 4 equal parts. Do not knead. Roll each piece to about 1/8 inch thick. Spread with cooled filling. Roll jelly-roll style and place seam down in a greased pan. Let rise for 1 hour. Bake 40 - 45 minutes at 350F. Filling 2 - 3 pounds shelled ground nuts 2 or 3 cups sugar 1 can pet milk or 1 pint half-and-half 2 tsp vanilla 2 tsp salt 1/2 cup butter or margarine 4 egg whites beaten- optional Mix milk, salt, margarine and sugar. Heat slightly until margarine melts and sugar is dissolved. Add nuts then to stretch mixture you can fold in beaten egg whites.