The expression “dirty water” dogs is a term usually associated with NY/NJ area push carts. It really just means the more hot dogs cooked in the same pan of water all day long, the “dirtier” the water is. The excess salt and fat that builds up in the water is all that gives them the colorful name. Rumors abound but it definitely does not mean hot dogs cooked in water from the NY City Hudson River water!
Customer J Riveria says he always crushes the first hot dog in the pot and boils it down until the water starts to darken, giving him instant “dirty water.”
Other add a splash of beer or apple cider vinegar – bon appetite!