Bacalhau (salt Cod)

De salt cod as per instructions on box or if you have access to salt cod not in a box, cover with water, changing about every couple of hours or overnite, to desalt. Taste the water to see if is to your satisfaction. Flake cod into large pieces. Slice potatoes and onions. Place potatoes, onions, pimento and olives in separate piles on wax paper. Oil an ample casserole and layer with 1/2 half cod, cover with layer of potatoes, onions, pimento, olives and tomatoes. Repeat, but save some olives and pimento for garnish. Dribble oil evenly over all, sprinkle with pepper, bake 350 for 1 1/2 hours or til tender.