Despite its name, the recipe for egg cream does not include eggs nor cream. It is a frothy combination of chilled milk, chocolate syrup, and seltzer. Although its origin is not entirely clear, the drink is almost exclusively associated with New York.
It is believed that it first appeared sometime in the early 1900s, among the eastern European Jews who settled in New York. The drink was incredibly popular until ice cream parlors and soda fountains—where it was mostly made—started to dwindle.
He undoubtedly helped popularize the drink, and allegedly, until his shop closed, it used to sell up to 3,000 egg creams a day. Explanations for the name often include theories that is was a wrong translation of French chocolate drink or derivation from Yiddish echt keem, roughly translated as pure sweetness.