Rub the salt, pepper and pepper flakes into the ribs and place into a glass baking dish. Pour the vinegar over the ribs and cover with plastic wrap. Refrigerate overnight, rotating the ribs in the vinegar twice.
Preheat oven to 375 degrees. Drain the vinegar from the baking dish and roast the ribs for 1 1/2 hours. Increase oven temperature to 400 degrees. Remove ribs from oven and brush with some barbecue sauce. Return ribs to oven and roast for another 30 minutes or until tender. Serve ribs with extra barbecue sauce.