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4 medium baking potatoes, (about 1 1/2 pounds)
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Vegetable cooking spray
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1 tablespoon water
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1/4 cup onion, chopped
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1/2 cup carrot, sliced (1/8-inch slices)
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1/2 cup celery, sliced (1/4-inch slices)
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1 pound ground lamb, lean
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1 cup tomato sauce
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1 teaspoon Worcestershire sauce
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