Time Out says
When the locals thought that they’d seen it all as far as hamburgers in Lisbon go, Ground Burger appeared and taught everyone a lesson. They are simply the best burgers in town and, as such, it's no surprise they are now one of the delicious eateries available at Time Out Market Lisboa. What is happening in the restaurant's laboratory, in full view of the customers is pure magic: 150 grams of Black Angus meat, inside a brioche bread made right there, toasted inside, combined with quality ingredients and accompanied by onion rings. Anything on the menu is good, and goes well with both the XL (yes) milkshakes and the craft beers.
Perfect for: going to the United States without leaving Lisbon.
Must try: the Ground Burger, with cheddar, lettuce, tomato, purple onion and GB sauce.