Sweet and Sour Chicken

12 whole chicken breasts, boned or 24 mixed chicken pieces
1 lg. green pepper, diced
1 c. brown sugar
1 c. ketchup
1 can (No.2) crushed pineapple
3 T. prepared mustard
1 lg. onion, diced

Simmer ketchup, custard, sugar and pineapple in a saucepan for 20 minutes. Meanwhile, saute onion and green pepper in a little oil in a frying pan. After 10 to 15 minutes, add onion and green pepper to saucepan mixture, and continue cooking for 10 minutes. Pour over seasoned chicken pieces. Bake boned breasts 45 minutes at 375 degrees; other parts 1 1/2 hours at 350 degrees.