Die fette Kuh (the fat cow) was founded in 2011 and was a game changer back then. There were not so many burger shops in Cologne back then though (4, if I remember correctly)... Nowadays there is at least one in every neighbourhood.., and even though the quality is not the same nowadays, “die fette Kuh” is still a place to go for a nice burger. No competition for 7 years, respect.
Steepshot