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.
Place spareribs in a large stock pot with barbeque sauce, onion, salt, and pepper. Pour in enough water to cover. Bring to a low boil, and cook approximately 40 minutes. Preheat grill for high heat. Lightly oil grate. Remove spareribs from the stock pot, and place on the prepared grill. Use the barbeque sauce in the saucepan to baste ribs while cooking. Grill ribs, basting and turning frequently, for 20 minutes, or until nicely browned.