Wash the fish fillets, dab dry and halve lengthwise. Sprinkle with 1-2 tbsp. lemon juice
Wash the herbs, pluck them and chop them coarsely except for a little bit. Place fish fillets next to each other on the work surface and cover with herbs. Season with salt and pepper. Roll up and fix with skewers
Bring 1/4 l water, 3 tbsp lemon juice, white wine, 1 tsp salt, peppercorns and bay leaf to the boil. Cover the fish rolls and let them simmer at low heat for about 8 minutes
Stir sour cream and starch until smooth. Rinse the sprouts and let them drain. Lift out the plaice rolls and keep warm. Sieve the fish stock and bring to the boil again. Stir in sour cream and bring to the boil briefly. Season sauce with horseradish, salt, pepper and sugar
Arrange fish rolls and sauce. Sprinkle with sprouts. Garnish with remaining herbs and lemon slices. Serve with broccoli and rice