1Spray 3 1/2- to 4-quart slow cooker with cooking spray. Place bell pepper and onion in cooker; top with turkey. Mix tomato sauce, vinegar and Italian seasoning in small bowl; pour over turkey and vegetables.
2Cover and cook on Low heat setting 7 to 8 hours.
3Place turkey on cutting board. Use 2 forks to cut or break up turkey into thin pieces; discard bones. Return turkey to cooker. To serve, spread cut sides of rolls with pesto. Fill with turkey mixture, using slotted spoon; top with cheese.