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.
4. Clean and oil cooking grate. Place short ribs, bone side down, on cooler side of grill about 2 inches from flames. Brush with 1/4 cup glaze. Cover and cook until ribs register 195 degrees, 1.75 to 2.25 hours, rotating and brushing ribs with 1/4 cup glaze every 30 minutes. Transfer ribs to large platter, tent loosely with foil, and let rest for 5 to 10 minutes before serving. Whisk all ingredients together in bowl.