Wash the potatoes and cook in boiling salted water for 15-20 minutes. Then rinse with cold water and peel. Peel onions, slice very thin. Wash the chives. Cut off tips about 10 cm long. Cut the rest into very small rolls. Dice ham.
Cut beetroot and potatoes into slices. Heat vinegar and broth. Season with salt, pepper and sugar. Pour over the potatoes while still hot. Carefully fold in onions, beetroot, small chives rolls, diced ham and oil. Serve sprinkled with the chives