This is a recipe I have worked on for a while and I think it is just about right. It goes well with just about anything from fried fish to hamburgers, and is to die for on a pulled pork sandwich. If you are going to use it with Q, reduce the amount of dressing you add to the cabbage so it's not too sloppy. For best results refrigerate over night to allow flavors to marry.
This is an old French Canadian recipe I have been making for years. Even people who don't like turnip will like this, since the addition of the other vegetables blend in and hide the normally strong turnip taste. Depending on your taste, you can experiment with the relative amounts of the vegetables, eg: increase the onion or potatoes, decrease the turnip.