OK, well if you say unique, Tangierine Cafe in Morocco has some interesting selections. There are some wonderful pastries and sandwiches in Kringla (Norway), China's Lotus Blossum cafe is nice. Fish Shop in UK is well, fried fish, Germany has Sommerfest with wursts, apple pie with vanilla sauce. Their sit down restaurant is a buffet for under $20. Liberty Inn (USA) is burgers, chicken, salads and BBQ. Cantina de San Angel is as you said taco's and texmex fare.
Those are the less expensive options, but I would suggest trying some of the sit down restaurants as well, Canada for steaks and cheddar cheese soup, Rose and Crown (UK) sitdown is not too pricy...nice bowl of lamb and barley soup!, France is nice, Morocco as others have said is a somewhat undiscovered gem, Japanese restaurants are OK (IMHO), Italy is a bit pricy and as I am used to good Italian, not much of a departure, China not much different from local Chinese, the Mexican restaurant I think is also another nice surprise.
Think I got most everything there...