Peel 2 onions and cut into rings, cucumbers into slices. Wash and halve the apple and remove the core. Cut apple into pieces. Whip crème fraîche and sour cream a little.
Fold in onions, cucumber and apple. Clean, wash and cut the spring onions into rings. Wash and pluck the dill. Rinse matie fillets briefly under cold water, dab dry with kitchen paper and cut into pieces.
Add the herbs, spring onions and dill to the cream sauce. Season with a little salt and pepper and arrange in a herring pot. Serve garnished with dill. Serve with boiled potatoes.