cheese still on my mind. I had to have it. I do not own the book, but luckily the recipe is available on the Modernist Cuisine website . It's not your average macaroni cheese. There is no flour in the recipe; instead, the cheese and liquid are emulsified using something called sodium citrate. There was a lot of discussion on Twitter about where this could be found, with several suggesting it could be procured from a pharmacy. Down to my local independent pharmacy I went to ask. It turns out sodium citrate is used as a treatment for cystitis. Awkward. The pharmacy had it, but only in cranberry flavour (by the way, if cranberry juice has been debunked as a treatment for UTIs, I suspect cranberry flavouring isn't going to work either). Explaining that I needed it for culinary purposes and that cranberry flavour simply wouldn't do, I continued my quest. Boots didn't have anything matching that description, so it was on to the independent pharmacy in Camden Town where I also buy my citric acid (I have no idea what the medical use for citric acid is, but I use it for making elderflower cordial). This time I was prepared with my "I am making a recipe that asks for sodium citrate. Do you have any?". The pharmacist foraged behind the counter before producing another packet of cranberry flavour. Nope. Then we realised that not all of the packets looked the same, and there was one packet not labelled