Form into 4-6 oval patties and brown in large sauté pan, approximately 2-3 minutes each side. Remove and place in shallow backing dish and finish in 350 degree oven for 10-15 minutes.
Dice potatoes, mushrooms, and remaining ½ sweet onion. Brown onion in 3 Tbsp. butter. Add mushrooms and potatoes after onions have begun to sweat. Add beef stock/broth, salt and pepper to taste. Bring to a slow simmer adding broth as needed approx.15 minutes.
Remove Salisbury Steaks from oven and serve with hash
See this recipe in Mary's Food and Wine Blog!