I’m the sort who makes vast pronouncements about Cajun cooking. As I am from Opelousas, Louisiana, and most people outside of Louisiana think a Cajun is either a) a mythical being, b) Emeril or c) Adam Sandler in “The Water Boy,” I’m not exactly shy about telling most people they don’t know what they’re talking about and they likely haven’t had Cajun food. The sad reality is that in most places, Popeye’s red beans and rice is the closest thing to authentic you’ll find (and it’s actually pretty good). After an exchange about gumbo on Twitter, I figured I’d quit mocking people for not knowing any better and provide you with a roadmap to true gumbo bliss.