Bacalao a la VizcainaThe Spanish brought dried cod to Mexico in the 1500s. Mexican cooks adopted the fish into local preparations, and it is now a tradition in Mexico to serve this classic dish from the Basque region of Spain, the day after Christmas. In Oaxaca, the dish is called Bacalao Navideño, where it's served on Christmas Eve.In the United States, dried salt cod can be found in many supermarkets, and in Italian or Latin-American markets. It's essential to soak the salt cod in cold water for many hours, changing the water several times to remove the saltiness and the strong smell. If the fish has been heavily salted and is hard as a board, it will take 20 to 24 hours to soften. A lightly cured fish will be a bit flexible and will soften in about 12 hours. If properly prepared, salt cod is excellent and worth the effort.