Mix all Southwestern Rub ingredients in small bowl. Rub mixture over ribs. Wrap tightly in plastic wrap and refrigerate at least 4 hours but no longer than 12 hours.
Heat coals or gas grill for indirect heat. If using charcoal grill, place drip pan directly under grilling area, and arrange coals around edge of firebox. Place ribs over drip pan or over unheated side of gas grill. Cover and grill over medium heat 1 hour 30 minutes to 2 hours, turning occasionally, until tender.
Mix salsa, chipotle peppers and marmalade in small bowl. Brush over ribs during last 10 to 15 minutes of grilling. Heat remaining salsa mixture to boiling; boil and stir 1 minute. Cut ribs into serving-size pieces. Serve salsa mixture with ribs.
Special Touch: Arrange these robust ribs on a platter surrounded with sprigs of fresh cilantro and halved orange slices.
Did You Know?: When food is cooked away from the heat source, it's called ""indirect-heat"" grilling. This is the best way to cook large and long-cooking foods, such as these ribs, because the indirect heat won't overcook the food. Because there's no fire under the food, there's also less chance of burning during the longer cooking time.
