The night before, make incisions in pork butt and stuff with jalapeno peppers. Then, rub with your favorite blend of Cajun spices.
Start fire in smoker about 13 hours before you want to serve the pork. When the temperature reaches 200 degrees F, put pork butt in, uncovered. About 7 hours later, take meat out and baste with your favorite BBQ marinade, wrap pork in foil and return to smoker. Turn heat up to about 300 degrees F and let cook about another 5 hours.
When the bone slides out, the pork is done. Remove from smoker and pull pork apart. Serve on a bun and if, desired, your favorite barbecue sauce.