Beef with lamb

2 tablespoons safflower oil 2 tablespoons butter, unsalted 2 pounds stewing beef or lamb or pork, cut into 1-in cubes 3/4 teaspoon salt 1 x black pepper[...]

2 eggs 1/2 cup dry breadcrumbs 1/2 teaspoon salt 1/4 teaspoon black pepper 1 lb ground beef 1 lb ground lamb 2 tablespoons olive oil 1 medium onion , chopped[...]