• prep: 20 min
• cook: 0 hr
• total: 20 min

servings:

Wrapped in foil, the spiced ribs oven-cook in intense heat; the foil locks in their moisture for supremely tender results. On with the sauce and over to the grill, and they're ready.

• 2 slabs pork spare ribs (2 1/2 pounds each)
• 2 tablespoons chili powder
• Coarse salt and ground pepper
• 1 tablespoon butter
• 1/2 small onion, grated
• 2 garlic cloves, minced
• 1 1/2 cups ketchup
• 1/3 cup cider vinegar
• 2 tablespoons Worcestershire sauce
• 1/4 teaspoon cayenne pepper
• Oil, for grates

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