Wash the potatoes and boil in water for about 20 minutes. Peel onions and garlic and dice finely. Wash the chives and cut into small rolls. Drain potatoes, rinse with cold water, peel and let cool.
Heat oil in a pot, fry onions and garlic until transparent. Stir in honey. Add vinegar and 100 ml water. Bring to the boil, stir in broth. Remove from heat.
Stir in mustard. Pour into a large bowl. Cut potatoes in thick slices directly into the hot marinade. Fold in chives. Season to taste with salt and pepper and leave to stand for about 1 hour.