Which Benihana magic mustard sauce recipe Should I use? The one with our without heavy cream?

There are two different mustard sauce recipes out there, the main difference is that one calls for heavy cream, the other does not. Has anyone tried both? Which one is closer to the restaurant’s version?

Squid With Mustard Ginger Cream Sauce?

Could someone give me the recipe from “The Frugal Gourmet Cooks With Wine” [1986, I think] for “Squid With Mustard Ginger Cream Sauce”? [It is excellent]. By the way, Jeff Smith, I bid you peace.