The World Of Zipangu
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After some careful consideration and testing, I found out my family could all eat and digest demon meat just fine. They went through a similar thing than I did, where it is so spicy the throat feels like its melting, but once they got past that and got used to the intensity, the spiciness becomes almost addicting.
Benladann, Miranda, Benladra, and Kate all ate a few dozen dishes with demon meat, accompanied with some Elixir I made using Divine Medicinal Herbs to make sure they wouldn't get some sort of terrible stomachache.
And the results came quickly, just half an hour after their meals, their bodies seemed to slightly adapt. It wasn't as if they could wield the energy, they had no way to produce it or store it, but their bodies gained a natural Resistance.