For the spinach-salmon roll, cut the spinach leaves as small as possible or chop in a blender. Beat whole eggs with salt until foamy, fold in spinach, Parmesan and cheese, season with nutmeg and pepper.
Spread the mixture evenly on a baking tray lined with baking paper. Bake in oven at 180 °C hot air for about 12 to 15 minutes and let cool. Spread cream cheese on the cooled dough, spread some horseradish on it and top with salmon. Drizzle the salmon with lemon juice.
Then roll up lengthwise, wrap in plastic wrap and refrigerate for 3 hours. Cut the roll into slices 2 fingers wide and serve the spinach-salmon roll.