Turn the pan down to a lower setting, sprinkle a light layer of sugar over the top of the onions and spread the onions evenly over the base of the pan. Leave on a low heat for 30 minutes. While your onions are simmering, prepare the rest of the vege by cutting the shallots into quarters and dicing the broccoli into very small pieces. Also, peel and chop your potatoes into small chunks.