You can switch up the ingredients in this recipe if you would like - add carrot or cranberries, take out the sausage and just make it vegetable, use a different bread, add different herbs, etc. As long as the base ingredients stay the same - the butter, stock and eggs, you can make the stuffing whatever you would like. The sausage and stock already have a lot of salt in it, so watch how much you season. If you don't use sausage, you may want to add ¼ - ½ teaspoon salt to make up for it for flavor.