I've lived in Flint, Michigan my entire life, and I was brought up on Coneys. The recipe has always been kept "top secret", and every restaurant has a slightly different version. But my friend's grandmother opened and ran one of Flint's top Coney Island restaurants for many years, and she gave me this recipe. The original recipe calls for beef kidney, heart and suet. But guess what? That's what hot dogs are made from! That's why ground hot dogs are a good substitution. I've tried and tasted many copycat recipes for Coney sauce, but I'm convinced that this one is the best. Coneys are traditionally served using a steamed hot dog bun, a koegel vienna hot dog (any vienna hotdog will do) then topped with the sauce, yellow mustard and finely chopped onions. Yum! The friend also noted that if it tastes like something is missing.. add more cumin. By the way, Koegel Viennas are now available to order online!