If you can get past the trapped spirit part, you could let him cook it in your absence, maybe visit your aunt? If there's no way around the trapped spirit, shouldn't there be a way to free it? Would it help to perform the same ritual that you use when hunting?
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I'm sorry, Idk if I'm helping at all. I'm trying here, but having a hard time understanding. Btw, crustaceans (sp) FREAK ME OUT BIG TIME, so I wouldn't want to be in my home the same time as 1 anyway.
Goodluck, hope you come to an agreement that works for both of you.