If you want to make nachos from scratch, first you must synthesize the sodium citrate.
— Carl Sagan, probably
okay so according to https://www.huffpost.com/entry/nacho-cheese-sodium-citrate_n_6108794 the trick is to dissolve it in a little liquid and then stir the grated cheese into the liquid
So far my experiments in actually USING it to make nacho sauce haven't been particularly successful though.