3 sirloin old onion mushroom Recipes

egg, quick oats (oatmeal), onion, finely chopped, divided, salt , plus more to taste, ground black pepper , plus more to taste, ground sirloin, up to 2 tbsp vegetable oil, divided, button mushrooms, finely chopped, all-purpose flour, warm water

lean boneless sirloin (trimmed of fat and gristle) or 2 lbs bottom round steaks, in 1 piece (trimmed of fat and gristle), salt, fresh ground pepper, butter, onion, thinly sliced, flour, mustard powder (or 1 tbsp prepared dijon style mustard), dry white wine, tomato paste (optional), minced onion, mushroom, thinly sliced, dry white wine, sour cream, warmed