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Instructions:
In a large bowl, mix together the grated onion (and its juices), the breadcrumbs (1/3 cup), the egg, the kosher salt (1 teaspoon), and the black pepper (1/2 teaspoon) until well combined.
Add the ground beef to the bowl and mix to combine with the breadcrumb and onion mixture. I recommend using your hands for this.
Heat a large skillet over high heat. Only after it’s searing hot (after about 2 minutes), add the olive oil (1 tablespoon) to the pan and swirl to coat.
Add the patties to the hot pan and cook for 2 minutes on each side- they should a have nice brown color. To get the best color, don’t move them until the two minutes are up.
Remove the patties to a plate.
Add the butter (2 tablespoons) to the skillet, then add the sliced mushrooms after it’s melted.
Cook the mushrooms for 2 minutes, until golden. Then, sprinkle the flour (2 tablespoons) over the mushrooms. Stir the mushrooms, coating each of them in the flour, and continue to cook for 1 more minute.
Add the beef broth (2 cups), stirring constantly to incorporate the flour, and bring it to a simmer.
Add the steak patties back into the gravy mixture and simmer, uncovered, for 5 more minutes, or until they’re fully cooked and the gravy has thickened.
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