Dahl,
Cincinnati chili is really "greek style meat sauce". To most, it is an acquired taste. What I basically tell people, when eating Cincinnati style chili, is to have an open mind. Don't think of "Texas chili {chile}", red or green chile. It is more sweet than hot. It has nothing to do with "chile".
Your guess that "Chinese five-spice powder", is involved, is not that far off. All of the five flavors - sour, bitter, sweet, pungent, and salty are found in Cincinnati chili, as well.
The Skyline chili recipe, is, of course, a closely guarded secret, but some people detect a hint of cinnamon, nutmeg, cloves, or allspice, as well as cumin, chocolate, vinegar, etc. It seems to be a "bastardized" version of
stifado ~~
.
http://www.cooks.com/rec/view/0,1727,158187-232207,00.html I guess, since I grew up with it, I am just accustomed to it. I love a chili cheese sandwich {no hot dog}, with mustard and extra onion!!