Wash the tomato, cut into small cubes. Cut the cheese into cubes, olives into rings. Put everything in a bowl, mix.
Combine oil, lemon juice, oregano, salt and black pepper in a small cup. Beat until smooth.
Combine vegetables and boiled shrimps in a bowl, pour over the sauce, mix.
Wash lettuce leaves, shake off the water, dry and put on the bottom of the salad bowl. Transfer the salad to the leaves, cool and serve.
Helpful hints: The salad will be tastier if the shrimp is not boiled, but stewed: heat 1 tbsp of olive oil, fry the chopped clove of garlic until the smell appears, then put the peeled shrimp and fry, stirring, for a couple of minutes. Add 1 tbsp of dry white wine to the pan and simmer for 5-6 minutes. Cool the finished shrimp.