Dough: melt butter. Add flour and salt. Make a well. Add balance of ingredients. Roll dough very thin on a floured surface.

Filling: Saute onions in chicken fat or oil. Add to mashed potatoes. Spread on dough and roll as for a jelly roll. Cut excess dough before roll is too fat (after 3 or 4 turns). Place on greased cookie sheet; brush with oil. Bake at 350° for 45 minutes, or until nicely browned. Cut into serving pieces and serve hot.