Place half the ribs in single layer on large sheet heavy-duty foil. Bring up foil sides. Double fold top and one end to seal packet.
Add 1/4 cup water to packet through open end. Double fold remaining end, leaving room for heat circulation inside. Repeat to make second packet. Grill 45 min. to 1 hour or until ribs are done.
Meanwhile, blend remaining ingredients in blender until smooth.
Remove ribs from foil; discard foil. Return ribs to grill; brush with sauce. Grill 15 min., turning and brushing occasionally with sauce.
