Seems like Achatz is experimenting with offal (sweetbreads, heart); I don’t recall such items being on the menu before, and in a way it’s also funny that such “lowly” foods should be given such ethereal presentations.
There's a very memorable section in The Soul of a Chef where Ruhlman talks about Keller using offal. I wonder if Achatz is taking some cues from that usage/time period, or if maybe it's just his turn to try organ meats.
Either way, I know what's going on my Xmas list this year, but I don't know if I've been nice enough for this. Amazing report, Ronnie.