Place half the ribs on sheet of foil. Combine sugar and seasonings; rub half evenly onto ribs. Bring up foil sides. Double fold top and one end to seal. Add 1/4 cup water to packet through end. Double fold remaining end, leave room. Repeat
Grill 45 min. to 1 hour or until ribs are done. Remove ribs from foil; discard foil
Return ribs to grill; brush with half the barbecue sauce. Grill 15 min., turning and brushing occasionally with remaining barbecue sauce