"Old-style pubs have it right: Sitting down to a generous helping of shepherd's pie is a true pleasure; making it is happily simple. We've added sharp cheddar to our mashed potatoes for a snappy topping...."
INGREDIENTS
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2 pounds baking potatoes (about 4), peeled and thinly sliced
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Coarse salt and ground pepper
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1 tablespoon vegetable oil, such as safflower
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6 medium carrots, halved lengthwise, quartered if large, and thinly sliced
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6 celery stalks, thinly sliced
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1 large onion, chopped
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1/2 teaspoon dried thyme
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1/4 cup all-purpose flour
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1/4 cup tomato paste
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2 pounds ground beef chuck
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1 cup whole milk
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1 1/2 cups shredded sharp white cheddar (6 ounces)