I started a new game and cannot make Heat Occisia. I read up on it, but when I talk to the Priestess, it just says Nothing when it asks what I want to talk about.
So you could read about Heat Occisia, but you couldn't talk about it with Priestess? Weird, the requirement for both of those are the same.
I'll check it. For now you can use this site if you have any troubles with recipes: LD - recipes
Did you check the book or note in your home after seeing the shopkeeper get sick? i think you need to do that before the lidzardess have the option to talk about that recipe and be able to learn it without manually crafting it, there should be an option talking about how to make the Surpur, after having a look at that, the Heat Occisia option should appear when talking to the lizardess in the ruins.