Step 1

In a 5- to 6-quart slow cooker, combine onion, oregano, bay leaves, chipotle, adobo sauce, tomatoes (and puree), salt, and pepper. Add pork and turn to coat completely.

Step 2

Cover and cook on high until meat is pull-apart tender, about 6 hours. Transfer pork to a bowl; shred with two forks. Return pork to pot, and toss with sauce. Discard bay leaves.

Step 3

Serve pulled pork with rolls, coleslaw, and pickles.