Sweet and Sour Sauce

Recipe from my mom. Serve with chicken and rice.

1 can crushed pineapple
1/4 cup white vinegar
1/4 cup brown sugar
1 T soy sauce
2 T corn starch

Drain pineapple, saving the juice. Add water to reserved juice to make 3/4 cup. Stir ingredients except for pineapple together in bowl. Microwave 2-3 minutes,or until thick, stiring every minute. Add pineapple. Microwave until warm.