Yes, but you will be able to taste the cauliflower in it and the final product will be a little more sharp. If using cauliflower, replace the potatoes with the same amount of chopped cauliflower (1 3/4 cups). Boil the cauliflower along with the carrots just as the directions note for the potatoes. Instead of 1/2 cup water, start with 3/4 cup and add 1-2 more tablespoons after blending, if needed, to thin out.