In a large skillet or wok, stir-fry chicken and onion in oil until onion is tender. Add garlic; cook 1 minute longer. Stir in the apples, water and seasonings.
Bring to a boil. Reduce heat; simmer, uncovered, for 12-15 minutes or until chicken is no longer pink, stirring occasionally. Stir in the tomatoes, jalapeno and cilantro; heat through. Serve with rice.
Wear disposable gloves when cutting hot peppers; the oils can burn skin. Avoid touching your face.