Porto's contribution to the bacalhau canon: shredded salt cod layered with sliced potatoes, onions, eggs and olives, baked together with olive oil and parsley.

Jose Luis Gomes de Sa, a 19th-century cod merchant in Porto, sold his family's recipe to a chef at the Restaurante Lisbonense in the late 1800s. The recipe was condition: never change it. The dish spread from Porto across Portugal and remains the city's contribution to the bacalhau preparation canon, eaten on Christmas Eve and at family Sunday lunches.

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