Pour the bean water into a saucepan. Put the beans in a correspondingly large bowl. Stir cucumber vinegar and sugar into the bean water and heat slowly, do not boil. Season to taste often and, if necessary, add seasoning. Then pepper a lot and finally add the oil. Stir a little more until everything is mixed and pour over the beans. Then let the salad stand in the refrigerator for about 4-5 hours. It is best to start a day in advance, then he has really pulled through.