Halve Hahn

Halve hahn is a Rhenish sandwich consisting of a split rye roll (röggelchen) that is typically buttered and topped with a thick slice of medium-ripe gouda cheese, pickles, and raw onions. Mustard is commonly added as well. It is popular throughout the Rhineland, especially in the cities of Cologne and Duesseldorf, where it can be found at most restaurants, pubs, and beer gardens.

The origins of this dish are debated, but halve hahn most likely originated from Cologne in the 1870s. It is eaten as a snack between gulps of kölsch beer.