Combine ingredients for the rub. Oil racks and massage with the rub. Leave set for 10 minutes while you heat the grill to 180 degrees. Smoke ribs directly on the grill for 1 hour.
Whisk together ingredients for the sauce. After the racks have smoked for 1 hour, increase the heat on the grill to 300 degrees. Place ribs in an aluminum roasting pan. Pour sauce over ribs and flip to coat ribs well. Cook for 3 hours. Take ribs off the grill. Place on a plate to let rest.
Strain sauce through a sieve into a small pot to remove all solids. Skim off fat. Add marmalade and vinegar. Bring to boil and then reduce to a simmer. Cook for 25-30 minutes. Coat ribs in sauce and finish with garnishes.
Notes
The ribs cook as good on a campfire as they do on the grill.