How to Make It
In a large enameled cast-iron casserole, cook the bacon over low heat until crisp, about 6 minutes. Pour off all but 1 tablespoon of the fat.
Add the butter and garlic to the casserole and cook over low heat until the garlic is fragrant, about 30 seconds. Add the celery, onion and jalapeño and cook, stirring occasionally, until the onion is softened but not browned, about 8 minutes. Add the Rich Fish Stock, corn and potatoes and bring to a boil over moderately high heat. Boil until the potatoes begin to soften, about 10 minutes. Mash a few of the potato slices against the side of the casserole to thicken the soup. Add the tomatoes and season with salt and pepper.
Add the bluefish and cook over low heat for 5 minutes. Remove from the heat and let stand for 10 minutes. Gently stir in the cream and basil and serve.