Double wash short ribs, this removes any excess fat. Place them on a paper towel and pat to dry. Spray a large baking pan (I used a 11x14 pyrex glass pan) add all of your short ribs to the pan, set aside.
Mix all dry ingredients for dry rub, including brown sugar, split into 2 bowls, set aside. In a small bowl whisk soy sauce, maple syrup, rice vinegar and sesame oil together. Pour wet mixture over all of the ribs, make sure all are coated. Sprinkle 3/4 of dry rub over all of short ribs, rub the dry rub into the ribs and make sure they are well coated. Reserve the other 1/4 of the dry rub for once the ribs are cooked. Cover the ribs and place in the fridge for 4 - 48 hours to marinate. Do not leave them in the fridge for longer than 48 hours.
Preheat the oven to 325 degrees F. Take short ribs out of the fridge and leave at room temperature for at least 1 hour before cooking. Cover the ribs tightly with foil and bake at 325 for 4 hours, for the last 30 minutes of the bake, remove the foil and bake uncovered. Alternatively you can bake the ribs at 350 degrees F, for 2 - 3 hours covered, for the last 30 minutes of the bake, remove the foil and cook uncovered.
When the ribs are done cooking, remove them from the oven. The bones should fall right out, discard the bones.
You can either shred all of the meat by hand or you can place all of your meat in a kitchen aid and mix it on low with the whisk attachment, this will quickly shred your meat. Once shredded, add a couple tablespoons of your dry rub and toss to coat, you can add more if you want more of a dry rub flavour.