INGREDIENTS
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1 cup bread crumbs
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2 tbsp unsalted butter
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1/3 white onion, minced
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1/4 tsp ground allspice
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2 tsp kosher salt, or to taste
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1/4 tsp white pepper, freshly ground, or to taste
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1/2 cup milk
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1 tsp Worcestershire sauce
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3/4 lb lean ground beef
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1/2 lb lean ground pork
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1 large egg, plus 1 egg white, beaten
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1 vegetable oil, for greasing the baking sheet
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2 tbsp unsalted butter
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2 tbsp all-purpose flour
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1 1/2 cup los socium beef broth
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1 tsp Worcestershire sauce
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1/4 cup heavy cream
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1 kosher salt, to taste
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1 black pepper, freshly ground, to taste
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2 tbsp fresh parsley, chopped (optional)