Easy Pork Carnitas

2 pork tenderloins (about 1 pound each)
1 jar of salsa verde (green salsa–any kind)
1 can Rotel tomotoes
1 can chopped green chiles
1 onion, chopped in large pieces
Cover in crockpot and cook on low until pork easily forks apart (about 10 hours). Serve buffet-style with flour tortillas, cheese, cilantro, avocado, tomatoes, lettuce and sour cream.