What sauce is Gordon Ramsey using for this dish? Gordon Ramsay has a trailer on YouTube for his MasterClass course. The link for the video is here: Gordon Ramsay's MasterClass (YouTube).

I have attached the screenshot at 0:21



It looks like cream or something else - is that beef wellington too? What is that sauce as I wish to make this dish!

Thanks
The sauce in question here is pomme purée. This was answered by the community but a special thanks to @Luciano, @ElendilTheTall, @GdD and @Dorothy. 

Happy Cooking