DIRECTIONS
Preheat oven to 325°. In a small bowl, combine brown sugar, salt, pepper and cayenne. If necessary, remove the thin membrane from back ribs; discard membrane. Rub brown sugar mixture over ribs. Transfer to large roasting pans. Add 1 in. hot water. Bake, covered, until ribs are tender, 2-1/2 to 3 hours.
Meanwhile, place peaches in a blender; cover and process until smooth. In a large saucepan, heat oil over medium heat. Add onions; cook and stir until tender, 12-15 minutes. Add brown sugar, chipotle peppers, adobo sauce, vinegar, mustard and peach puree; bring to a boil.
Reduce the heat; simmer, uncovered, until slightly thickened, 25-30 minutes.
Drain ribs. Grill ribs, pork side down, covered, on an oiled rack over medium heat until browned, 5-7 minutes. Turn ribs; brush with 2 cups sauce. Cook 5-7 minutes. Serve with remaining sauce.
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