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.
At this rate the ribs should be cooked through and tender after 4 hours. Go longer if you can. The longer you smoke at a low temperature the more tender and flavorful the ribs will be. Remember that you need to hit an internal temperature of 165oF before they can be served.s with all traditional Barbecue, pork ribs should be cooked low and slow with a good dose of smoke. This process will require a smoker of some kind, although you can do it with a kettle charcoal grill. You will need a 200 degree temperature, smoke, and patience.