INGREDIENTS
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Steaks
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1 1/2 pounds lean ground beef
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3/4 cup finely chopped onion
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1 cup breadcrumbs
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1 tablespoon Worcestershire sauce
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1 teaspoon beef bouillon granules
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2 eggs, lightly beaten
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1 teaspoon kosher salt
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1/2 teaspoon pepper
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2 tablespoons butter
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Vegetable oil
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Sauce
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1 large yellow onion, sliced into 1/4-inch-thick slices
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8 ounces portobello or cremini mushrooms, sliced
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2 tablespoons tomato paste
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1/4 cup flour
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3 1/2 cups beef broth
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1/2 cup dry red wine
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1 teaspoon kosher salt
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1/2 teaspoon pepper