Chicken Stir Fry

1 C. chicken, cut into small chunks or thin strips (apx. 2 chicken breasts)
1 T. corn starch
1 T. soy sauce
2-3 t. oil
1/4 C. water
2 carrots, sliced thin*
2 stalks celery, sliced thin*
1 C. sauce (sweet and sour, spicy orange, teriyaki, etc.)
1 C. pineapple chunks or mandarin orange slices
*other veggies can be used, like onion slices, snow peas, broccoli florets, etc.

Coat chicken with corn starch and soy sauce. Heat oil in fry pan, then add chicken. Cook until outside of chicken is white. Add water and simmer covered 10 minutes, stirring twice. Add carrots and celery and fry for a couple of minutes while stirring. Then add the sauce and simmer covered for 10 more minutes. Add pineapple or oranges and heat through. Serve with cooked rice.