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In New York City, the natural-casing all-beef hot dogs served at Katz's Delicatessen, Gray's Papaya, Papaya King, Papaya Dog and any Sabrett cart are all made by Sabrett's parent company, Marathon Enterprises, Inc. of East Rutherford, New Jersey (Levine 2005). Nathan's hot dogs, which are all-beef and come in both natural-casing and skinless, were also made by Marathon until several years ago (Levine 2005). Local kosher brands—which are not permitted natural casings—include Hebrew National, Empire National (Levine 2005). The usual condiments are mustard and sauerkraut, with optional sweet onions in a tomato based sauce invented by Alan Geisler, usually made by Sabrett. Hot dogs are available on street corners as well as at delicatessens. New York street vendors generally store their unsold dogs in warm-water baths, giving rise to the semi-affectionate moniker "dirty water dog."