Try somethings that are served cold and not hot or warm, like chicken and tuna salads served on crackers or bread, raw veggies not cooked,
cold hard boiled eggs not fried,
cold pizza, salads and anything else you can think of that's not always cooked. The smell of anything cooking sent me to another room when I did tx, and then I couldn't eat it unless it was served cold and I'm not a picky eater so I think I know how he feels...