INGREDIENTS
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1/2 cup (1 stick) unsalted butter, divided
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3 small leeks, light green and white part only, cleaned and finely chopped
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1 medium carrot, peeled and finely chopped
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2 medium celery stalks, finely chopped
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1/4 cup all-purpose flour
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4 cups chicken stock
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1 cup half-and-half (or light cream)
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1/2 lb. Vermont sharp cheddar, shredded
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1 tsp. dry mustard
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1 tsp. Worcestershire sauce
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Salt and pepper
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Cayenne pepper to taste
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1 Pippin (or Macintosh) apple, peeled, cored and finely diced