I dunno, I just roasted a small bag of frozen cauliflower in a baking dish with evoo until soft... obviously wait for that to cool before putting it in a food processor, along with a clove or two of fresh garlic... I seasoned with several scoops of nooch (don't be shy), Mrs. Dash, some onion powder, dill weed, a touch of pink salt, & paprika... added some fresh lemon juice & unsweetened soymilk... blend until kick-*** & creamy.
I went with this recipe the first (& only other) time I made it:
Dairy-Free Roasted Cauliflower "Cheese" Sauce | Detoxinista -- It was in order to do something with all the roasted cauliflower I had from Thanksgiving, which I had frozen.... You don't need fresh to make this. And I'd always opt for plant-milk/broth over plain old water for the liquid.... and always use whatever seasonings you dig, don't "follow" recipes.... I threw a little cayenne in this time....
All I know is I can make vegan cheese sauce without pricey cashews, it's not gritty, it has
far less fat, & has the added health benefits of cauliflower!