Chef John's Macaroni and Cheese
Ingredients:
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1 (16 ounce) package elbow macaroni
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¼ cup butter
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¼ cup all-purpose flour
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¼ teaspoon dried thyme
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¼ teaspoon cayenne pepper
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⅛ teaspoon white pepper
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3 cups milk
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1 pinch ground nutmeg
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¼ teaspoon Worcestershire sauce
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1 teaspoon salt
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3 cups shredded sharp Cheddar cheese, divided
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1 teaspoon Dijon mustard
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½ cup panko bread crumbs
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1 tablespoon butter, melted