1.5 kg onions
1/4 cup olive oil
2 tablespoons balsamic vinegar
2 tablespoons brown sugar
Peel and finely chop onions, place in a large saucepan or frying pan along with the olive oil. and butter.
Cover and saute for 15 minutes over a medium heat. Stir and then reduce the heat to low, continue to cook covered for 30 minutes. Add the balsamic vinegar and brown sugar and cook for a further 10 minutes. The onions should be a rich brown colour.