For the cream, peel and finely dice the onion. Finely dice the gherkins. Wash 1 apple, quarter, core and finely dice. Wash the dill, dab dry and chop finely. Mix yoghurt, sour cream and apple juice.
Stir in onion, apple, cucumber and dill. Season to taste with salt, pepper and sugar. Leave in a cool place for about 30 minutes. Meanwhile wash the fish, dab dry and cut in half lengthwise. Roll up the fillets and pin them with a wooden skewer. Wash the remaining apples, cut into quarters and remove the core. Cut apples into about 20 fine slices. Sprinkle with lemon juice. Place a fish roll on each apple slice. Arrange on a platter, dress with salad and radishes as desired.
Cut apples into about 20 fine slices. Sprinkle with lemon juice. Place a fish roll on each apple slice. Arrange on a platter, dress with salad and radishes as desired. Put a blob of yoghurt cream on each roll. Garnish with cranberries and dill to taste. Serve with buttered pumpernickel
With 10 people: