Alan Stark Geisler (September 30, 1930 – January 6, 2009) was an American food chemist, best known for creating the red onion sauce most often used as a condiment topping on hot dogs in New York City.
[1] Sabrett brand hot dogs and the red onion sauce which Geisler created are the flagship products of Marathon Enterprises, Inc.
[1] Papalexis's customers included hot dog street vendors, who often made a popular homemade, but time laborious, onion sauce as a topping.
[1] Papalexis asked Geisler to come up with a factory-made onion sauce for the hot dog vendors to sell at their carts in New York City.
[1] Geisler and Papalexis partnered to form their own company, called Tremont Foods, to market and make the new red onion sauce.
[1] The sauce was initially sold to New York City hot dogs vendors under the brand names Tremont Foods or House of Weenies.