Barbecued Pulled Chicken Sandwiches(this could also be made with country style ribs)

1 8-ounce can reduced-sodium tomato sauce (I used regular)
1 4-ounce can chopped green chiles, drained
3 tablespoons cider vinegar
2 tablespoons honey
1 tablespoon sweet or smoked paprika
1 tablespoon tomato paste
1 tablespoon Worcestershire sauce
2 teaspoons dry mustard
1 teaspoon ground chipotle chile
1/2 teaspoon salt
2 1/2 pounds boneless, skinless chicken thighs, trimmed of fat
1 small onion, finely chopped
1 clove garlic, minced
Stir tomato sauce, chiles, vinegar, honey, paprika, tomato paste, Worcestershire sauce, mustard, ground chipotle and salt in a 6-quart slow cooker until smooth. Add chicken, onion and garlic; stir to combine. Put the lid on and cook on low until the chicken can be pulled apart, about 5 hours.Transfer the chicken to a cutting board and shred with a fork. Return the chicken to the sauce, stir well and serve.
You can use breasts instead of thighs but if you use thighs it will not be as dry.