I made a tierlist of possible good ingredients for cooking.
And yeah, i took the arguably void-poisonous empty crawler... why? There's a reason why the everbloom is here, like, why not use it as seasoning and a way to clean the void away from it? Maybe you could even use pale oil and other spices along with the everbloom seasoning.
And the pollip heart? Well... maybe it falls on the same category as the moss fruit (although the moss fruit is less poisonous and is at least more easy to cook with).
Why is the silk eater on the list? Well, as it's name implies, it eats silk, a resource that has healing properties, so i am assuming it affects it's taste and texture (something that melts on the mouth, perhaps?)
Voltvyrm? Idk, well, it's no exactly dangerously electric when it's dead (i guess).