Wash the potatoes and cook in boiling water for about 20 minutes. Meanwhile, boil the eggs for about 10 minutes, drain, rinse and peel. Stir sour cream, crème fraîche and 3 tablespoons milk until smooth. Season with salt, pepper, sugar and lemon juice. Wash the dill, dab dry and pluck flags from the stems. Put some flags aside for garnishing. Finely chop the remaining dill and stir into the sauce.
Wash the maties, dab dry and cut into strips of about 3 cm. Clean and wash spring onions, dab dry and slice diagonally. Fold the matie and spring onions into the sauce. Drain, rinse and peel the potatoes. Finely chop the eggs. Arrange potatoes and dill bites together. Sprinkle with egg and garnish with dill