Russian Meat Balls
Cook onion in rendered kidney fat until wilted.
Mix beef, veal, onion, bread, salt and little pepper.
Knead well and chill. Wet hands and form mixture into balls the size of gold balls.
Roll in crumbs and fry in butter or beef fat until brown all over.
Remove and keep warm. Add sour cream and mushrooms to pan.
Heat. Pour sauce over meat.