Lay out lettuce leaves on a serving plate, on top the tomato, previously cut into not very large pieces. Salt and pepper all this on top. Mix olive oil with vinegar, add a little more pepper and salt to them.
Remove the fish from the jar and tear it into medium pieces, then put the tomato on top and sprinkle with finely chopped greens.
Pour the salad on top with the prepared sauce and can be served.