Wash the potatoes carefully, dab dry and place on a baking tray. Cook in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 50 minutes. In the meantime clean and wash spring onions and cut them into fine rings. Wash and chop the dill. Cut 2 slices of salmon into fine strips. Mix cream cheese and crème fraîche.
Fold in spring onions, dill and salmon strips. Season to taste with salt, pepper, horseradish and lemon juice. Cut remaining salmon slices into 12 pieces. Arrange 3 potatoes each with the cream and a small piece of salmon on a plate. Serve garnished with lemon and dill