Tutorial. How to make a custom food for a custom microwave.

I don't know if this is the right place to ask this necrodog, but I've been working on custom food for vampires by cloning some Fish & Chips, but how did you get it to work with that plasma pizza you made? I got the basic code down for mine and I got the cloned Fish and Chips in the game but even though made with Plasma Fruit, it doesn't affect my vampire's thirst. Any help please?