01 -
In a medium bowl, combine ground beef, panko breadcrumbs, egg, Worcestershire sauce, minced garlic, Dijon mustard, chopped onion, salt, and black pepper. Mix thoroughly to integrate all ingredients.
02 -
Divide the meat mixture into 6 equal portions and shape each into a patty approximately 3/4 inch thick. Place patties on a parchment-lined surface and set aside.
03 -
Heat vegetable oil in a large skillet over medium heat. Add patties and cook for 5 minutes per side until browned and cooked through. Remove patties from skillet and keep warm.
04 -
In the same skillet, sauté sliced onions over medium heat until softened and golden, about 5 minutes. Add mushrooms and cook until tender, approximately 3 minutes.
05 -
Sprinkle all-purpose flour evenly over cooked vegetables. Stir to coat and cook for 1 to 2 minutes to eliminate raw flour taste.
06 -
Combine beef stock, tomato paste, Worcestershire sauce, pressed garlic, Dijon mustard, thyme, salt, and pepper in a small bowl. Gradually pour into skillet while stirring continuously to prevent lumps.
07 -
Once gravy begins to thicken, return beef patties to skillet. Lower heat to medium-low, cover, and allow to simmer for 15 minutes, flipping patties halfway through to ensure even cooking and flavor absorption.
08 -
Check internal temperature of the thickest patty to ensure it reaches at least 160°F. Remove from heat and serve hot with accompaniments of choice.