the experience at Ground Burger was absolutely amazing. The waiters were really helpful and friendly, but first and foremost the BURGERS were by far one of the best ones we have had in Lisbon (living here since 1 1/2 years with many burgers included). It is typical American style, but due to the fact that the burger is not the biggest, you don't feel completely filled and heavy afterwards, but just fine and happy. The french fries are awesome as well, by the way. Definitely come again.