Remove the sheets of strudel dough from the refrigerator about 10 minutes before processing begins. Mix crème fraîche and horseradish. Season with salt and pepper. Wash the dill, shake dry and pluck the dill flags from the stalks
Place a damp tea towel on the work surface and a dry one on top. Place 2 pastry sheets on top of each other. Halve lengthwise in the middle. Spread a thin layer of horseradish crème fraîche. Place a slice of salmon on the bottom of each pastry sheet, spread a few dill flags on top and roll up. Place on a baking tray lined with baking paper. Process remaining ingredients in the same way
Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 18-20 minutes. Melt butter. About 5 minutes before the end of the baking time, brush the sticks with butter. Remove from the oven and serve garnished with celery green. Serve the rest of the horseradish cream separately