Preparation Steps

• In a large bowl combine ground beef, breadcrumbs, beaten egg, half of the diced onion, Worcestershire sauce, 0.5 teaspoon salt and the black pepper. Mix gently until combined; avoid overworking the meat.
• Divide the mixture into four equal portions and shape into oval patties about 3/4-inch thick. Chill in the refrigerator for 10 minutes to help them hold shape.
• Heat vegetable oil in a large skillet over medium-high heat. Add the patties and sear 3-4 minutes per side until a brown crust forms and internal temperature reaches 160°F. Transfer patties to a plate and keep warm.
• Reduce heat to medium and add butter to the same skillet. Add the sliced onion and remaining salt. Cook, stirring occasionally, until the onion is soft and lightly caramelized, about 6-8 minutes.
• Sprinkle the flour over the onions and cook, stirring, for 1 minute to remove the raw flour taste.
• Gradually whisk in the beef broth, scraping up any browned bits from the pan. Bring to a simmer and cook until the gravy thickens, about 3-5 minutes. Taste and adjust seasoning as needed.
• Return the hamburger steaks to the skillet, spoon the onion gravy over them, and simmer gently for 2-3 minutes to reheat and meld flavors.
• Serve the hamburger steaks hot, spooning extra onion gravy over each portion and garnishing with chopped parsley if desired.