Peel and thinly slice the onion. Peel the cucumber and slice it as well. Wash the tomatoes and cut them in half. Place these ingredients in a bowl.

Cut the bread into cubes and put it in a small bowl with the vinegar and enough water to cover. Let it soak for 5 minutes, then squeeze out the excess liquid and add the bread to the vegetables.

Add the drained butter beans and season everything with salt and olive oil.