INGREDIENTS
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2 racks St. Louis-style spare ribs, (2 1/3 to 3 pounds each), cut into 3- or 4-rib sections
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1/4 cup dark brown sugar, packed
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2 tablespoons chili powder
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1 tablespoon salt
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2 teaspoons onion powder
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1 teaspoon allspice
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1 1/2 cup (12-oz) can root beer, (not diet), divided
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2 tablespoons cornstarch, dissolved in 2 tablespoons cold water -