Sweet and Sour Chicken/Pork

1-2 chicken breast or pork chop, diced
1 onion, sliced
1 bell pepper, sliced
1 can pineapple chunks, drained (save juice)
1 tbsp corn starch
2 tbsp (red) vinegar
2 tbsp brown sugar
2 tbsp ketchup

Directions:
1. Heat oil in wok or skillet and stir-fry meat. (Or deep-fry battered meat if desired) Set aside.
2. Stir-fry onion and bell pepper in wok. Set aside.
3. Mix corn starch and vinegar and pour into wok. Add sugar, ketchup, pineapple juice.
4. Cook until thick. Return meat and vegetables to wok and toss.
5. Add pineapple chunks and toss for 1 more minute.