Wash potatoes thoroughly, dab dry and prick several times with a fork. Wrap them individually in lightly oiled aluminium foil and bake on the baking tray in a preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for 50-60 minutes
Clean spring onions. Wash spring onions and dill and, except for a little dill for garnishing, chop finely. Cut 2 slices of salmon into fine strips. Stir cream cheese and yoghurt until smooth. Fold in spring onions, dill and salmon strips. Season to taste with salt, pepper, lemon juice and horseradish
Cut the remaining salmon slices into thirds. Cut potatoes lengthwise and break open. Serve with salmon cream and salmon. Garnish with lemon and the rest dill.