Diner Salisbury Steak

Directions

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   1.
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   In a medium bowl mix together the ground beef, scallions, bread crumbs, egg, dehydrated onions, garlic powder, and mustard and shape into four 1/2-inch-thick oval patties.
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   2.
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   Preheat oven to 120 degrees F. 3.
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   Heat the oil in a large skillet over medium heat and cook the patties for 3 to 4 minutes per side, or until no pink remains.
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   Remove patties from skillet to a paper towel lined platter to drain and place platter with the Salisbury steaks in oven to keep warm.
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   Discard the oil in the pan and wipe clean.
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   4.
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   Return the skillet to the heat and add the gravy, the tomato paste, water, horseradish, and mushrooms and cook for 4 to 5 minutes, or until the mushrooms are tender, stirring occasionally.
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    5.
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    Return the warm steaks to the skillet, lower the heat to low and simmer for another 2 or 3 minutes.
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    6.
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    To serve, place 1 steak, a serving of corn, and a serving of mashed potatoes on each of 4 plates and place 1/4 of the mushroom gravy over each steak.
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    Serve immediately.