Remove membrane from rack of ribs. Chris Lilly, "If you don't remove the membrane, it takes on a waxed paper consistency and is not a great chew." With a paper towel, grab the end of the membrane on the back of the ribs and pull.
Build a charcoal fire for indirect cooking using the 2-zone fire. Situate the coals on only one side of the charcoal grill, leaving the other side void. Add a small aluminum pan to the void side of the grill and fill it halfway with water. (Leave burners off on one side or the front of a barbecue or electric grill.) For more info on the 2-zone method, see How to Grill Like a Pitmaster: BBQ Tips from Chris Lilly
In small bowl, combine salt, brown sugar, chili powder, coffee, cocoa, black pepper, garlic powder, onion powder, ancho chile pepper, coriander and turmeric.
Generously apply the dry rub onto the front and back sides of ribs. Gently pat to ensure that the rub will adhere. (Even though it's called a 'rub', there's no need to rub it in.) Let them sit for 15-20 minutes.
When the grill reaches 250°F, place ribs meat-side up on grill grate above the void area, close lid and cook until ribs are tender, about 3 1/2 hours. (If you're going to use wood chips or briquets for smoking, add them to the charcoal just before placing ribs on grill.)
Remove ribs from grill and let rest, uncovered, 5 – 10 minutes to reabsorb its juices. Your meat will not get cold, it actually continues to cook while resting. Slice ribs between bones and serve.