If I understand correctly, the friend is coming to visit you and will be cooking in your kitchen, right? I don't think I'd provide a specific recipe, necessarily, but I would definitely choose something very simple for him to cook. Honestly, I'd do that even if he were a fantastic cook because I've had people cook in my kitchen before and they tend to make much bigger messes than I do, or than I suspect, they do in their own kitchens. I don't know why that is but it's definitely been my experience over the years.
Anyway, I'd suggest something like baked chicken or fish, maybe, and then say, "Oh and that pear and walnut salad you do would be fabulous to go with it!"
In addition, I'd feel terribly uncomfortable having someone cook in my kitchen while I sat in the other room doing nothing. He's going to need your help somewhat anyway, if only to figure out where the pans & utensils & spices are, so if it were me, I'd step up as sous-chef. Not that you'd want to take over in any way or even try to guide him, but just to sort of police things in my own kitchen. Maybe to help clean as you go, for example, in order to get the menial tasks done which might otherwise get overlooked.