Break fresh beans into pieces approx. 3 cm long or boil frozen green beans in salted water. The beans should retain some bite.
Cook the peeled potatoes in salted water for about 20 minutes.
Drain the beans in a sieve and cut the slightly cooled potatoes into cubes. Mix both in a salad bowl. Mix the ingredients for the sauce together and pour over the beans with the potatoes. Mix everything well and let it steep for about 1 hour or longer.
Just before serving, fry the diced bacon in a pan with a little oil and pour over the salad. Mix well again.
Another tip: Grandma’s bean salad tastes best lukewarm with a boiled sausage and a cold beer.