Mix together beef, onion, rice, crumbs, milk, andseasonings.
Shape into 1″ balls. Fry slowly in fat in skillet. Turnto brown evenly.
Add soup mixed with hot water. Cover and simmer about 1 hour.
Stir mushrooms and liquid into gravy in pan. [This really is the way the original recipe ends. I assume it is appropriate to at least continue to cook the casserolebriefly right after you add the canned mushrooms. It would be better with (sautéed) fresh mushrooms.]