Serious Eats article on classic New Orleans Po' Boy sandwiches, which are deep fried chunks of something in a bun with remoulade sauce. I understood they're usualy made with oysters, but their article mentions Shrimp Po' Boys and Fish Po' Boys, which would be easier for me to make (oysters not easy to find). This link connects to the central article which in turn has links to individual recipes; recipes for the remoulade are contained within the recipes.