Hamburger "Steaks" smothered in an onion brown gravy!
In a 12-inch skillet with the butter and oil over medium-high heat, fry the patties on both sides until no longer pink in the middle. (about 5 minutes a side)
Remove patties from the skillet and pour off any excess grease.
In a small bowl, combine the beef broth and the corn starch. Mix well.
Add the beef broth mixture and Worcestershire sauce to the onions and stir as the mixture comes to a low boil. The sauce will reduce and thicken.