1. Fry the onions in the oil until soft. Finely shred the cabbage and core and chop the apple. Add to the pan and fry for a few minutes. 2. Add the apple juice. Don't cover the cabbage, put enough to cover quarter to half of it, otherwise you get too much juice. Add more later if necessary. 3. Cook until the cabbage is tender, stirring every few minutes. This will take about an hour. If necessary, sweeten to taste with maple syrup or sugar.