@LV:
Sample it as you are adding the cabbage. The cabbage is there basically as filler to add some volume so you don't have to keep slicing apples! It does add some texture contrast, but raw cabbage is fairly bland so it doesn't add a whole lot to the taste. You may find that using less cabbage suits your taste better, especially if you don't need to have a bunch of this at the table.
Also, if you do make it let me know how you like and if you'd change anything so the recipe can be improved!