I’ll be honest and say straight up that I don’t like mushrooms. But if you can dice them up into a stew or something so that I don’t notice that’s fine. But I can’t help but fixate on them whenever I see them on food, even if the taste isn’t that strong. Same with onion rings. Onion rings were ruined when I noticed they weren’t just some weird French fry my parents bought.

Granted I’m reasonable about food and don’t ask for special orders. So I won’t through a fit about stuff. But there no need to force someone to change if you don’t think they are willing. Doubly so if they have autism.

I can relate to this one- I generally don't like seafood, if I smell or taste it, I won't enjoy what I'm eating even if it's something else. But I can eat canned tuna, as long as it's the good stuff, and a few times I have been talked into trying someone's fish dish that they "cook differently"- usually it's not different, but on two occasions, I have been surprised. 20 years ago a neighbor made some buttered shrimp that was quite good, and a few years ago my wife got me to try some smoked salmon, and I was ok with it.

Not sure about Autism related food issues, but I have ARFID and most likely that would cause me a ton of anxiety and do some damage to my ability to eat food you make again.

That said, there's a slight chance that I don't experience that, and an even more slight chance that I'd actually be able to eat it again despite knowing. In that case, I'd be ecstatic because there's not a single person on this planet who wishes I could eat more food than myself, but I'd still ask you about every food I eat at your house again to avoid it happening again.

I've tried "just make it and don't tell me what's in it" as a strategy before and found very quickly that the slim chance it helps get me over a certain food isn't worth the much more likely chance that it makes it worse.