Group 2: for children weighing 15 - 25 kgs (33 - 55 lbs), roughly 4 to 6 years. Booster seats that only fit into Group 2 are less common. Most are group 2 and 3, or groups 1, 2 and 3. Groups 2 & 3: for children weighing 15 - 36 kg (33 - 79 lbs), roughly 4 to 11 years.
Broil the ribs for about 5 minutes, until the sugar in the dry rub is bubbling and the ribs are evenly browned. Bake the ribs: Set the oven to 300Â°F. Move the ribs to an oven rack in the middle of the oven. Roast for 2 1/2 to 3 hours for spare ribs or 1 1/2 to 2 hours for baby back ribs. Halfway through cooking, cover the ribs with aluminum foil to protect them from drying out.
Preheat oven to 350 degrees F (175 degrees C). Cut spareribs into serving size portions, wrap in double thickness of foil, and bake for 1 1/2 hours. Unwrap, and drain drippings. (I usually freeze the drippings to use later in soups.) Place ribs in a large roasting pan. In a bowl, mix together brown sugar, ketchup, soy sauce, Worcestershire sauce, rum, chile sauce, garlic, mustard, and pepper. Coat ribs with sauce and marinate at room temperature for 1 hour, or refrigerate overnight. Preheat grill for medium heat. Position grate four inches above heat source.