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PLACE meat in slow cooker; top with soup mix, onions and barbecue sauce. Cover with lid. Cook on LOW 8 to 10 hours (or on HIGH 4 to 5 hours).
REMOVE meat from slow cooker; cut off and discard excess fat. Chop meat into small pieces or shred with fork. Return to slow cooker; stir until evenly coated with sauce.
FILL rolls with meat mixture and Singles just before serving.