I submit that boudin is true
Cajun food. While many people have heard of
jambalaya,
red beans and rice, or
gumbo, you have to actually live in southwest
Louisiana (or
marry someone from there) to really hear of it, much less actually try it. For that reason, I tend to regard it as a test: have you been there, or merely tried the food?
Though traditionally made of pork and rice in a sausage casing, other meats include crawfish, veal, and alligator. It can be quite mild or spicy. My father actually describes it as a breakfast food. My wife, from Indiana, has become addicted to it.
Bonus fact: while it is good, the best is smoked. You can get it at Hackett's Cajun Kitchen in Lake Charles, Louisiana.