Alan S. Geisler (c. 1931 – 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. Specifically, the sauce, which is marketed as Sabrett's Prepared Onions, is usually served on Sabrett brand hot dogs sold by New York's many pushcart hot dog vendors.
One of his customers was Gregory Papalexis, who manufactured both hot dogs and hot dog buns. Papalexis's customers included hot dog street vendors, who often made a popular homemade, but time laborious, onion sauce as a topping. 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.
Geisler, with input from Papalexis, created a new, mass-produced onion sauce for hot dogs. The main formula and spice blends of the sauce consisted predominantly of onions, olive oil and tomato paste, which gives the sauce its distinctive red coloring. The sauce proved to be a hit with both the street vendors, who no longer had to make their own time consuming sauces, and hot dog consumers.
Geisler and Papalexis partnered to form their own company, called Tremont Foods, to market and make the new red onion sauce. The sauce was initially sold to New York City hot dogs vendors under the brand names Tremont Foods or House of Weenies.
Papalexis acquired Sabrett Food Products in 1989. As a result of the acquisition, Geisler's onion sauce became the only onion sauce served on Sabrett hot dogs by vendors in New York City. The red onion condiment also became available for purchase in supermarkets under the Sabrett's brand. It is marketed nationwide as "Sabrett's Prepared Onions."
As of 2009, Geisler's red onion sauce enjoys "a couple of million dollars a year in sales," according to Papalexis. Geisler's and Papalexis's original company, Tremont Foods, is currently a division of Marathon Enterprises, Inc., which owns the Sabrett trademark. (Marathon Enterprises is owned by Papalexis.) The only product made by Tremont Foods is the popular red onion sauce. The sauce is manufactured in The Bronx, but production is scheduled to shift to a new facility, in Fair Lawn, New Jersey, in 2009.
Geisler remained active with the company until his death in 2009.
Geisler died at his winter home in Hernando, Florida, on January 6, 2009, at the age of 78. Geisler had been suffering from a protein disorder called amyloidosis. He was survived by his wife, Jean Geisler, his daughter, Martha Geisler, his son, Glenn Geisler, his brother and a grandson.
- Levin, Jay. "Alan Geisler, 78; food chemist, hot dog hero", The Record (Bergen County), January 9, 2009. "Alan Geisler of Mahwah, a food chemist who created the tangy red onion sauce that pushcart vendors slather over Sabrett hot dogs, died Tuesday at his winter home in Hernando, Fla. He was 78.... In 1960, Mr. Geisler -- a Tenafly High School graduate who received a bachelor's degree in food technology from the Massachusetts Institute of Technology -- founded a company that manufactures emulsifiers, shortenings and other ingredients for the baking industry.... Mr. Geisler, a 45-year resident of Mahwah, was still active in the company he founded a half-century ago, Technical Oil Products Inc. in Boonton, said Glenn Geisler, a partner."
- "Alan S. Geisler, Hot dog sauce maker, 78". Associated Press. The Philadelphia Inquirer. 2008-01-12. Archived from the original on January 15, 2009. Retrieved 2009-02-01.