STEP 1: Chop the pineapple, chicken, onion and sweet red peppers. Mix together the water, vinegar, sugar and corn starch.
STEP 2: Heat the oil in a cook pot and fry the onion and the chicken until golden.
STEP 3: Add the pineapple and the sweet red peppers - heat for about 3 minutes.
STEP 4: Stir the liquid ingredients, add to the cook pot, and bring to a boil. The cornstarch will thicken and the sauce will coat all ingredients.
STEP 5: Serve plain, with rice or rice noodles.