TL;DR: Could you give me some advice what ingredients to avoid, maybe which are generally safe and what textures you like? Maybe tell me a bit about how you like your food prepared?

A friend, that occasionally visits is a picky eater. We talked quite a few times about what they like and especially about what they dislike. A big issue with that is that they can't really tell what they don't like in advance.

Usually, I cook something, they don't like it and we put in a batch of chicken nuggets or something like that. Last time they were here, they ate a bit, a spoon every now and then, so I think that was a step into the right direcrion. They didn't say they couldn't eat it, which they usually would be very vocal about if that was the case, but they also didn't eat a lot. Maybe 5 or 6 spoons.

I believe that circumstances are pretty different for each individual but could you give me some advice what ingredients to avoid, maybe which are generally safe and what textures you like? Maybe tell me a bit about how you like your food prepared?