Combine all spice rub ingredients. Separate out about ¼ of the mixture above and reserve the remaining ¾ cup for other rubbing occasions.
Lay the baby back ribs on a cutting board or other large surface. Season with spice rub on both sides (more so on the meaty side); allow to stand on the ribs up to 4 hours.
Prepare grill. Bring to moderate-high heat and sear meaty side of ribs until brown; flip; apply layer of sauce. Turn heat down to 160 degrees F – 175 degrees F. Flip and apply sauce again. Cook ribs for 90 minutes or more, continuing with the flip/sauce technique.