Bacalhau à Gomes de Sá is a classic Portuguese dish made with salted codfish, potatoes, onions, eggs, and olives. The codfish is first soaked to remove the excess salt, then cooked with onions until tender. The potatoes are boiled and sliced, then layered with the codfish and onions in a baking dish. The dish is topped with beaten eggs and garnished with olives before being baked until golden and crispy. Bacalhau à Gomes de Sá is a delicious and satisfying dish that is often enjoyed as a main course.