Thanks everyone for answering! I took pretty good ideas from here. I think the omni-to-vegan was maybe too sudden. I've tried to make vegetarian dishes instead, and he has received them very well. The pizza with couliflower and carrots got a specially welcome reception
He still likes meat, because he likes the taste and feeling of meat in the stomach. But I hope that as long as my vegan cooking skills go better, also his liking for vegan will go higher. He's determined to eat meat, though, so if he still wants meat there is nothing I can do about it. But I can reduce both our intakes.
Thank you to you all for your help! I also find tofu pretty unappealing, except if it's into miso soup.
What if you cooked in advance and combined dishes? I'm thinking if you made a pasta dish for example, you could heat up the meat sauce and add it to his and heat up your veggie sauce and add it to yours. Would something like that work?
That is a very good idea... That would save me time and let me make both vegan and omni dishes. I'll give a try to that one.