Add anything else you want like herbs, parsnips, turnips, fresh ginger, etc., if there’s room. This recipe fills a 4-quart slow cooker, without any additional vegetables, so you might not have the space for anything else. However, you might be able to add these later on, once things have cooked down and some of the water has evaporated. (This is a good opportunity to throw in some vegetables that need to be used up. You will strain them out. They are just for flavor.)