INGREDIENTS
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1 pound ground beef
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1 large egg
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1/4 cup breadcrumbs
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1/4 cup Parmesan cheese, grated
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1 tablespoon Worcestershire sauce
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1 teaspoon Kosher salt
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1/2 teaspoon black pepper
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1/2 teaspoon red pepper flakes
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1/4 teaspoon garlic powder
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1/4 teaspoon dried thyme
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1 tablespoon butter
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Parsley, garnish
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Mashed potatoes, for serving
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1 large white onion, sliced thin
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2 tablespoons unsalted butter
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2 tablespoons all-purpose flour
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2-3 cups beef stock
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Salt and pepper