How To make Pieczen Siekana Klops Polish Meat Loaf

3 lb Ground beef
1 lb Ground pork
1/4 lb Kidney fat, chopped fine
1 c Bread crumbs, day old
1 Onion, chopped fine
2 Egg yolks
1/4 lb Salt pork, chopped
3 tb Butter
1 tb Flour
1/2 ts Savory
1/2 c Cream
Salt and pepper Fry onion in butter until transparent, not yellow. Combine the meat, kidney fat, salt pork, bread crumbs, onion, egg yolks, and seasonings and mix very thoroughly with your hand. Shape into a loaf, rub with butter and bake at 350F for one hour. Baste often. In the last 15 minutes, sprinkle flour on meat and add cream.