According to Wikipedia, the "Holy Trinity" is the base for many classic New Orleans dishes including étouffée, gumbo, and jambalaya.
Lucky for you, we have found some veg versions of these classic dishes to meet your veggie-loving needs on Fat Tuesday!
Vegan & Gluten-Free Sausage Mushroom Étouffée at Books & Baubles
Mardi Gras Gumbo at The Vegan Road
Jambalaya at Girl Makes Food