Not always! You can easily make a delicious cauliflower alfredo with real milk and Parmesan cheese, but it's also easy to make it without dairy. To do this, replace the butter with a butter-flavored spread and replace the milk with a neutral milk alternative, like coconut milk. Don't forget to substitute nutritional yeast for the Parmesan. It can help to add a little Dijon mustard for extra flavor, too.