1/3 c  Red wine vingar
1/3 c  Salad oil
1 sm Onion; sliced, separate
-into rings
1 ts Salt
2 ts Dried parsley flakes
1 ts Prepared mustard
1 tb Brown sugar
1    Jar (12-oz) mushrooms;
-drained

Bring all ingredients except mushrooms to a boil. Add mushrooms and simmer
5-6 minutes. Refrigerate several hours in a covered container.