Step 1: Make the jerk seasoning: Place the chiles, scallions, garlic, ginger, cilantro, thyme, sugar, salt, allspice, cinnamon, pepper, and salt in food processor and grind to a coarse paste. Work in the oil, rum, and soy sauce to obtain a thick, but spreadable paste. Correct the seasoning, adding any ingredient you desire: the jerk seasoning should be highly seasoned.
Step 2: Prepare the ribs: Remove the thin, papery membrane from the back of each rack of ribs. Turn a rack meat side down. Insert a sharp implement, such as the tip of a meat thermometer, under the membrane (the best place to start is right next to the first rib bone). Using a dishcloth or pliers to gain a secure grip, pull off the membrane. Repeat with the other rack.
Step 3: Place the ribs on a baking sheet. Spread the jerk seasoning on the ribs on both sides with a rubber spatula and marinate in the refrigerator for at least 4 hours, or as long as overnight. You can also marinate the ribs in large resealable plastic bags.
Step 4: Set up your smoker following the manufacturer’s instructions and preheat to 225 degrees.
Step 5: Arrange the ribs, bone side down, in the smoker. (We hung them from the hooks in the Pit Barrel Cooker.) Add the pimento wood as specified by the manufacturer. Smoke the ribs until tender and the meat has shrunk back from the ends of the bones by 1/2 inch, 4 to 5 hours.
Step 6: Transfer the ribs to a large platter or cutting board, and cut the racks widthwise in half. Serve at once with lime wedges for squeezing.