Arrange the thinly sliced tomatoes on the outside of a platter.
Using a fork, pierce the thinly sliced cucumbers a few times each and arrange them in the middle of the platter (inside the circle of tomatoes).
Beat together the dressing ingredients (olive oil, parsley, mint, lemon juice, white vinegar, salt and pepper).
Pour the dressing over the salad, then cover with cling wrap and refrigerate until ready to serve.
Just before serving the salad, place the olives on top.Garnish with parsley sprigs and serve.