Cauliflower, a vegetable I don’t remember eating until I was in my 20’s, can now be used as a substitute for just about anything. It can be used as pizza crust, gnocchi, rice, bread, mashed potato substitute, steak, and so much more. Cauliflower is popular as a substitute because it’s lower in carbohydrates than the original food items and contains additional vitamins, minerals, and phytochemicals.