Hamburger Steak with Gravy

1lb lean ground beef

1/4 cup plain bread crumbs

1 pack Lipton onion soup mix

1 large white onion

1/2tsp salt

1tsp seasoning salt

1/2tsp ground black pepper

1 egg

1tbsp Worcestershire sauce

1tsp apple cider vinegar

1tbsp all purpose flour

1 cup beef broth 

1tbsp butter

1/2 cup milk

Slice half the onion and dice the other half. In a bowl mix diced onion with hamburger, lipton mix, egg, bread crumbs, salt, ground black pepper and worcestershire sauce. Form into 6 to 8 patties. Head a large skillet with butter and 1tbsp vegetable oil. Once hot add hamburger patties with the sliced onions. Cook 4 to 5 mins each side. Remove patties from heat, leave onion and add flour. Add in beef broth, milk, apple cider vinegar and seasoning salt. Once thicken add patties back in.