4 guajillo chiles, stemmed, seeded and toasted
1 onion, cut in half, divided
2 cans (14.5 oz. each) diced tomatoes, undrained, divided
2 lb. boneless pork chops (3/4 inch thick), cut into bite-size pieces
3 carrots, peeled, sliced
2 cans (15.5 oz. each) black beans, undrained
1 can (15 oz.) corn, undrained
1/4 cup chopped fresh cilantro
4 cups hot cooked long-grain white rice
24 round buttery crackers