How to Make It
In a large bowl, cover the salt cod with cold water. Cover and refrigerate for 24 hours or up to 2 days. Change the water three times a day.
In a large, enameled cast-iron casserole, heat the 2 tablespoons of olive oil. Add the garlic and cook over moderately high heat until fragrant, about 20 seconds. Add the zucchini, beans, onion, kale, escarole, potato and tomatoes with their juices. Add the water and crushed red pepper and bring to a boil. Simmer over moderately low heat, stirring occasionally, until the vegetables are tender, about 50 minutes. Season lightly with salt.
Meanwhile, preheat the oven to 400°. Set the bread on a rimmed baking sheet. Generously brush both sides of the bread with olive oil. Bake for about 12 minutes, until browned and crisp.
Add the cod to the casserole and simmer over moderately low heat until the cod is heated through, about 5 minutes. Using a wooden spoon, gently break the cod into 2-inch pieces.
Set the toasted bread in shallow bowls. Ladle the stew over the bread. Drizzle with olive oil and serve.