Jeff - I just posted the question to see if someone is willing to share the info.....I'll post it here if someone is!
The link for the post on the folks cooking through the book, with lots of pictures and recipes is
here. Just ignore where they start talking about brisket and one of our members is on here. Slightly dissing our forum and claiming people on here are telling him to cook his brisket at 450 degrees.....like I say just skip that part. I noticed it late so couldn't respond.
For the recipe here you go (these are not ingredients you will have at home)....This is all from Chris Hennes at Egullet so not my info but and I quote.....
No, this isn't some kind of play on words, or a joke-recipe, or some kind of fascinating modernist creation. It's just macaroni and cheese. This recipe is a clear demonstration that while you can use modernist ingredients to create some really crazy stuff, you can also apply them to simply take a classic dish and make it better. And believe me when I say it: this version of mac and cheese is so vastly, clearly superior to anything I've ever had it is mind boggling.
There are two keys to the dish, both related to problems with the original: the first is that when you make a cheese sauce with a bechamel base, you have to use a LOT of bechamel, and there is a limit to how much cheese you can add before it breaks. This winds up diluting the cheese flavor, and is part of the reason I would never consider making a traditional mac and cheese with a really great cheese: its subtlety would simply be lost, and you'd gain nothing over using a simpler cheese. The second key is that not only does bechamel dilute the cheese flavor purely by volume, it also has poor "flavor release" compared to, say, carageenan: the book spends a great deal of time talking about this sort of thing, and it's very helpful for understanding why these techniques work as well as they do.
So, the modernist version of the dish does away with the bechamel base: instead, you make a small amount of a solution of beer, water, sodium citrate (to emulsify the cheese) and carrageenan (the thicken the sauce). You then melt a huge quantity of excellent cheese into it (I used Cabot clothbound cheddar and Roomano Pradera Gouda), in effect making your own processed cheese block. You chill it down until you literally have a block of processed cheese more or less the consistency of Velveeta, and then you shred it. The pasta is cooked in just enough water for it to absorb, and then the shredded cheese product is stirred in. You wind up with a mac and cheese the same texture as if you had used Velveeta: perfectly, flawlessly smooth. Except it tastes incredibly intensely like the best cheeses in the world! Perhaps you have gathered here that I rather liked the stuff