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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.
Divide the beef mixture evenly into four. The easiest way to do this is to press the beef mixture into the bottom of the bowl and use your finger to “draw” lines dividing it into four quadrants. Form 4 oval shaped patties with your hands about 3/4ths of an inch thick.
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.
Remove the patties to a plate.
Add the butter (2 tablespoons) to the skillet, then add the sliced mushrooms after it’s melted.
Add the beef broth (2 cups), stirring constantly to incorporate the flour, and bring it to a simmer.
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