Boil the eggs in 10 minutes. Drain, cool and peel. Drain the mustard cucumbers and collect the cucumber water. Mix yogurt, sour cream or crème fraiche, mustard, 4 tbsp. cucumber water and apple juice. Season with salt, pepper and sugar. Pluck dill flags, chop and fold in. Cut onions into rings, gherkins into slices and apples into fine slices. Cut herring into pieces and eggs into wedges. Gently mix onions, mustard and pickles, apples, herring and eggs. Gently stir in the salad dressing. Put leaf lettuce to cool with lid closed and let stand for 1 hour. If necessary, season again with salt, pepper and sugar.
Preparation time: half an hour
Degree of difficulty: simple
Tip: The higher the fat content of the yogurt, the more aromatic and creamy the result!