INGREDIENTS
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2 tablespoons olive oil, divided
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1 onion, diced
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1 pound ground beef
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1 pound ground pork
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1/2 cup Panko*
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2 large egg yolks
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1/4 teaspoon ground allspice
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1/4 teaspoon ground nutmeg
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Kosher salt and freshly ground black pepper, to taste
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FOR THE GRAVY
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1/4 cup unsalted butter
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1/3 cup all-purpose flour
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4 cups beef broth
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3/4 cup sour cream
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Kosher salt and freshly ground black pepper, to taste
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2 tablespoons chopped fresh parsley leaves