Cologne is famous for its Kolsch Beer, a special beer only brewed in Cologne. It's a light ale and is served in the traditional 0,2 liter Kolsch glasses with are tall and cylindrical.
Drink Kolsch in an origin "Brauhaus" (the traditional German Pub where the beer is brewed). There the "Kobes" serves the fantastic ale and he serves one after another if you don't say "NO" and put the beer pad on your glass.
Thanks to Marita.