Set grill to medium. In a medium bowl, whisk together 1 cup orange marmalade, ¼ cup apple cider vinegar, 3 tbsp packed dark brown sugar, 1 tsp ground cumin, 1 tsp ground coriander, and 1 tsp garlic powder. Season with salt and pepper to taste. Brush 2 racks cooked baby back ribs with most of the sauce and place on grill set to medium. Cook 8–10 min., brushing with more sauce and turning occasionally, until lightly charred in spots. Remove from grill and brush with additional sauce before serving.
