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Pour 1/4 cup of extra-virgin olive oil into a paella pan and heat over medium-high heat until shimmering. Add the shrimp and saute briefly, about a minute on each side, then remove and set aside. Add the onion to the pan and saute until softened, about 10 minutes. Stir in the tomatoes and cook 2 minutes more. Mix together the salt, turmeric (or saffron), smoked Spanish paprika in a little dish to blend and stir into the pan with the onions and tomatoes. Add the calamari and cook until it starts to become a little firmer. Pour in the seafood stock, let it come to a boil, and let it cook for 5 minutes. Stir in the brown rice, spreading it evenly over the entire pan. If using monkfish, add it, along with the clams, dropping them evenly over the pan and pushing them down into the rice. If using cod, wait to add it with the shrimp. Let the stock come to a boil again and cook but do not stir for 10 minutes. Adjust the taste for salt, add the shrimp (and cod, if using), placing evenly over the pan and pushing them down into the rice. Let cook, still not stirring, until most of the stock has been absorbed, clams have opened, and fish is cooked. Adjust heat if needed; when done cooking there should be a nicely browned, caramelized crust on the bottom of the paella pan, but it should not be heavily charred or blackened. Remove pan from the heat and let stand until the liquid has completely absorbed, about 10 minutes. Serve immediately.