This Salisbury steak recipe has been in my family for years. It's easy enough to make, but tastes like it took hours to make. The gravy is delicious and sets itself when left overnight. I usually make enough extra gravy to pour over mashed potatoes. I'm always asked to make this dish when we have family gatherings or potlucks. It's one of those recipes that everyone seems to love.
In a large bowl, mix together 1/3 cup condensed French onion soup with ground beef, bread crumbs, egg, salt and black pepper. Shape into 6 oval patties.
In a large skillet over medium-high heat, brown both sides of patties. Pour off excess fat.
In a small bowl, blend flour and remaining soup until smooth. Mix in ketchup, water, Worcestershire sauce and mustard powder. Pour over meat in skillet. Cover, and cook for 20 minutes, stirring occasionally.