In alarge skillet over medium-high heat, heat up oil. Add frozen vegetables and sliced onion and cook, stirring frequently, for about 5 to7 minutes, until the vegetables have thawed and softened. Remove from skillet and set aside.
Add pork and seasoning to skillet over medium-high heat and cook, stirring frequently for about 5 minutes, until the meat is no longer pink. Add coconut aminos (or soy sauce) and pineapple chunks to the pork. Cook for a few minutes until pineapple begins to release its juices and has softened.
Add stir-fried vegetables back to the skillet and continue cooking until everything is heated through. Serve over rice or cauliflower rice and garnish with fresh cilantro.