A lot of people add nuts to carrot cake, however, I am allergic, so I made this graham cracker crumble. So delicious and adds a wonderful crunch. You will also see a lot of people want more moisture from their carrot cake, so here I use apple sauce. But you also might find recipes with bananas, pineapple, etc. Anything to add more moisture. This is usually why you'll also see oil instead of butter.