Lampredotto - The ultimate Florentine panino

I'll tell you what I know - it's made with the third stomach of the cow and it's the classic poor man's sandwich in Florence. The best place to get it is from one of the street carts found throughout the city center. I'll tell you what I don't know - what it tastes like. I'm fascinated by the thing, and honestly it smells pretty good, but I haven't had the guts to stomach it yet.