>>52912874>>52912928I've found this guide to be the most reliable as it tells you how to use the least ingredients necessary (pretty much just one serving of a thing before the usual 2 herbas) and clues you in on extra effects you'd want.
And additionally you can combine it with this simulator for extra measure if you want to be extra safe and make sure you do it right so you don't waste anything beforehand.
https://cecilbowen.github.io/pokemon-sandwich-simulator/ 