Place the ribs on a cookie sheet and cover them with foil. Leave the ribs out for one hour until they reach room temperature. Preheat the oven to 250 degrees Fahrenheit (121 degrees Celsius). Place the racks in the oven and bake the ribs for between 2 and 2½hours, or until they're tender. Remove the ribs from the oven and uncover them. Let them to cool for 15 minutes. Apply the barbecue sauce liberally to the ribs and return them back to the oven, leaving them uncovered.