Cook the green beans and potatoes. Peel the potatoes, slice them, and set aside.

Boil the eggs in water for 10 minutes to make hard-boiled eggs.

Wash and sort the lettuce. Wash and cut the tomatoes.

In a very hot pan, sear the fish for a few minutes on each side (depending on thickness), keeping the inside raw.

In a large bowl, add the lettuce, tomatoes, potato slices, green beans, and hard-boiled eggs. Add the olives and tuna.

Add the vinaigrette before serving.