This is a review from Cuildh
Golden Sauce - p. 106
This is a very easy sauce to make - simply put everything into the jug, cook for 20 minutes then zap for 1 minute. All the ingredients are probably in your pantry, so nothing special or extra to buy. My one tweak is to add a couple of teaspoons of mustard, but that's purely personal taste. It really doesn't taste of cheese, of course, but it is by far the most successful substitute I have found for a vegan 'cheese' sauce - it works really well with macaroni to make macaroni cheese, for instance. I have also used it as a sauce layer in lasagna.