Well, obviously food tastes are going to differ for everyone. But I think there are some things that are safer than others. Some westerners cannot stand Sushi or any seafood for that matter. If you want to cook him something... I would steer clear of anything raw for the first time. Also, those beans that are so popular over here - stay away from that. Maybe a simple Gyudon. Yeah, like a beef, rice and vegetable bowl. Then again I could be completely off base, he may enjoy something that he wouldn't normally get at home.