Salam,
Well, the name of the restaurant does not reflect their location, it was located at Shah Alam actually. But yeah, Klang or Kelang town is famous with one of their signature dish which is Lontong. Lontong was a well known Indonesian food, among Javanese people. There are several types of Lontong, but the one that are famous in Malaysia is known as Lontong Cap Go Meh in Indonesia. Well, you can read more about it here on Wikipedia.