Rinse the maties briefly under cold water, dab dry and cut into pieces. Peel onions and cut into thin strips. Clean and wash spring onions and cut into fine rings.
Mix sour cream and yoghurt, season with salt, pepper and sugar. Fold the matie, onions and spring onions into the cream. Heat the oil in portions in a large pan. Fry the potato pancakes in it in 3 portions for 6 minutes each at medium heat, turning after 4 minutes.
Remove and keep warm. Wash the chives, dab dry and cut into small rolls. Arrange potato pancakes and matie salad in small pans. Sprinkle with chives.