The dish's dark color comes from squid ink which also enhances its seafood flavor.
In addition to Valencia and Catalonia, this dish is popular in Cuba and Puerto Rico where on both islands it's known as arroz con calamares (rice with squid in Spanish).
Fideuà negra (black noodles in Catalan) is a variation made with noodles instead of rice and is usually served with aioli.
Basic cooking method
Make seafood broth from crab, fish, onion, bell pepper, garlic and bay leaves.