Combine ground beef, breadcrumbs, milk, and chopped onion in a large bowl.

Pat the mixture into a 3/4-inch thick layer in a large pan.

Cover the pan and refrigerate overnight.

Cut the refrigerated beef mixture into squares.

Dip each square in flour.

Brown the floured squares in Crisco oil.

Season the browned meat to taste.

Transfer the browned meat to a roaster.

Prepare the gravy by combining drippings from the pan with cream of mushroom soup and one can of water.

Pour the gravy over the meat in the roaster.

Bake at 350°F (175°C) for approximately one hour, or until cooked through.