This recipe for baccala salad is courtesy of Sal Scognamillo, owner of Patsy's.
Place cod in a large bowl of cold water. Refrigerate for 4 to 5 days, changing water each day.
Drain cod and cut into 3-inch pieces. Transfer to a large saucepan, cover with water, and bring to a boil over medium-high heat. Reduce heat to medium and cook until fish is easily flaked with a fork, 15 to 20 minutes. Drain and transfer cod to a bowl filled with cold water until cooled, 10 to 15 minutes.
Meanwhile, in a large bowl, whisk together olive oil, lemon juice, olives, garlic, and basil; season with salt and pepper.
Drain cod and flake with a fork. Add to bowl with olive oil mixture; toss to coat. Refrigerate at least 1 hour before serving. Serve chilled or at room temperature.