When you query the folks at Zydeco Louisiana Diner as to just why their mashed potatoes taste so good, they look at you quizzically and reply, "They're real." Duh. Of course they are. There's simply no way instant taters could provide such pleasure. Creamed soft but not so soft you don't find the occasional chunk of potato hidden inside, this godsend of a dish is finished off with lots of garlic and butter. Of course, the catfish and okra are great. But you really need only a large plate of mashed potatoes and a side of corn bread to leave Zydeco happy. Sure, you can almost feel your arteries clog up as you shovel them down. But what a way to go.