What's The Meaty Sauce You Always Find On Coney Island Hot Dogs? - Chowhound
Briefly

The Coney dog, often misattributed to Coney Island, likely originated from Greek immigrants who created it in Michigan, leading to a heated rivalry between local restaurants.
A Coney dog features a frank on a steamed bun, topped with Coney sauce — a runnier beef sauce — unlike traditional chili dogs that use thick chili.
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