PREHEAT broiler. Mix meat, barbecue sauce and onions; shape into eight
1/2-inch-thick patties. Place on rack of broiler pan.
BROIL 3 min. on each side or until cooked through (160ºF).
CUT each pita horizontally in half to open pocket, being careful to not cut through to opposite side. Spread insides evenly with dressing. Fill with burgers,Singles and tomatoes.