A. B. K.
Google
Simply great.. Burgers are brilliant, perfect taste every time, simple menu, everything in it is perfect.
(there's an option for a double decker now .. If you're a heavy guy as i' am) ;)
The burger is unmatched in Karlsruhe .. you'll get addicted to it easily.
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update: it kinda overpriced now .. i‘m not really into paying 15€ for a small burger/23€ for a double decker (without the supplements).