This place is near the International School Bangkok. It is the only place I have been able to find that comes close to a Chicago style hot dog. They actually have all beef hot dogs, but not all of the Chicago style fixings. Still good though...
The food is good, but there are only two tables in the place and is quite small.
I would go back for the hot dogs and maybe a burger.
http://www.bbqsandwichking.co.th/