In a crock pot add the crushed pineapple, chicken stock, soy sauce, salt, pepper, bell pepper and chicken breasts.
Cook on low for 6-8 hours or high for 3-4 hours.
1 hour before it's done cooking, stir in the cornstarch/water mixture and give it a good stir.
When finished cooking, shred the chicken and serve on buns or over brown rice.
Top with cilantro and pickled red onion!