For the salad, wash the potatoes for the dressing and cook for about 20 minutes.
For the rolls, drain the tuna and capers. Chop the capers. Pick the tuna with a fork. Mix both with sour cream and salad cream. Season with pepper. Spread on the turkey breast slices and roll up.
For the salad, peel and chop the onion. Wash the chives and cut into fine rolls. Clean, wash and shake the lettuce dry and pluck into bite-sized pieces. Wash and halve the tomatoes.
Wash the cucumber, peel if necessary and cut into slices.
Potatoes quench, peel and mash with a fork. Whisk vinegar, salt, pepper and some sugar. Add oil and 4 tablespoons of water. Stir in potatoes, onion and chives.
Mix dressing, tomatoes and cucumber. Mix in salad before serving. Place the rolls on top.