How to Make It
In a medium soup pot, heat 2 tablespoons of the olive oil. Add the shallots, garlic, chorizo and crushed red pepper and cook over high heat until the shallots are softened, about 5 minutes. Add the wine and cook until reduced by half, about 8 minutes. Add the clam broth and water and bring to a boil.
Meanwhile, in a food processor, pulse the basil, pine nuts, Parmesan and the remaining 1/4 cup of oil. Season with salt.
Add the clams to the soup pot and cook over high heat, stirring occasionally, until they open, about 8 minutes; transfer the clams to a bowl as they open. Add the shrimp and fish to the broth, season with salt and cook until the fish is opaque and firm, about 5 minutes. Return the clams to the pot, add the peas and cook until warmed through. Ladle the stew into deep bowls, drizzle with the pesto and serve with crusty bread.