Sweet and Sour Cabbage

2 tsp. olive oil
1 med. onion
1 sm. head red cabbage - cored and thinly sliced
salt and pepper
2 tbsp. balsamic vinegar
1/2n pt. blackberries

heat a 12 inc. skillet. Add onions.  Cook for 3 minutes or until tender.  Add cabbage and 1.4 tsp. cook until tender.  Add wine and vinegar. cook for 25 minutes.,