INGREDIENTS
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4 tablespoons butter
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1 onion, minced (reserve 1/4 cup)
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2 tablespoons minced garlic
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1 cup fresh bread crumbs
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1 1/2 pounds meatloaf mix (pork, beef, veal)
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2 teaspoons kosher salt
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2 teaspoons cracked black pepper
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1/2 teaspoon ground allspice
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1/2 teaspoon, plus pinch cayenne
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2 tablespoons chopped parsley leaves
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1 egg, beaten
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3 tablespoons all-purpose flour
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1/4 cup white wine
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1 1/2 to 2 cups beef broth
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2 tablespoons sherry vinegar
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1 cup sour cream
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1/4 pound Gruyere, shaved with a vegetable peeler
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3 tablespoons chopped chives