Preparation :
Hold the brains under running water and remove the thin skin. Boil 6 glasses of water with 1 teaspoon of salt in a saucepan. Put the brains into this saucepan and boil for 15 minutes. Remove saucepan from heat and allow it to stand for half an hour. Then, remove the brains and cut them vertically. Put brains in a serving dish. Place olives between brains. Garnish the sides of dish with sliced tomatoes and lettuce. Mix the lemon juice, olive oil and 1/2 teaspoon of salt together in a bowl. Pour dressing over as desired and serve.