Brush the potato peel well. Wash the potatoes and cook for 15-20 minutes in boiling water, drain, peel if necessary and leave to rest for at least 30 minutes. In the meantime, boil eggs for about 10 minutes until hard.
Cold quench, peel, chop finely. Wash and clean the cucumber and tomatoes. Halve cucumber lengthwise, cut into fine slices. Cut tomatoes in half. Cut bacon into small cubes. Wash chives and cut into small rolls.
Cut the potatoes into 1-2 cm cubes. Bring vinegar and broth to the boil briefly. Season with salt, pepper and sugar. Add oil and pour hot over the potatoes. Leave bacon in a pan without fat until crispy.
Carefully mix cucumber, tomatoes, bacon, chives, eggs and potatoes. Season to taste again and serve.