INGREDIENTS
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1 pound ground beef
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1/2 small onion, chopped
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3 cloves garlic, minced
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1 cup mushrooms, chopped
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1 10-oz. box frozen chopped spinach, thawed, squeezed dry
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1 tablespoon Worcestershire sauce
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1 tablespoon Dijon mustard
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1/3 cup grated Parmesan
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Salt and pepper
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3 large eggs, beaten
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3 tablespoons unsalted butter
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2 tablespoons all-purpose flour
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1 1/3 cups milk
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1/2 cup grated Parmesan
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Salt
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2 large egg yolks
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1 unbaked 9-inch deep-dish pastry pie shell