Wash the green stuff and finely shred it. Peel the cucumber, skin the tomatoes (if ripe, the skins will come away easily) and cut into thin slices. Place in the bowl in alternate layers. Let the top layer be lettuce with a few slices of tomato for garnishing. Slices of hard-boiled egg may be added if desired.
For the salad dressing, to every tablespoonful of oil allow 1 of lemon juice. Drip the oil slowly into the lemon juice, beating with a fork all the time. Pour over the salad.