Burger restaurants are hip and happening in Berlin. One of the tastiest places is The Bird, that started with a branch in Prenzlauer Berg near the Max Schmeling Halle but due to popular demand now also has a branch on the Kottbusser Damm.
Yes, the French fries are delicieus. But especially the insanely huge and fat burgers are phenomenal. In the days following your visit, your intestines will need some time to recover. But it’s definitely worth the sin. Beware: die to popular demand it is wise to make a reservation in advance.