Clean asparagus, cut off woody ends and peel asparagus) and wash thoroughly. Place the potato pancakes next to each other on a baking tray and bake in the preheated oven (electric cooker: 225 ° C/ gas: level 4) for about 20 minutes. Put asparagus in boiling salted water and cook for 18-20 minutes. In the meantime, peel and finely dice the onion. Wash the chives, dab dry and cut into fine rolls.
Mix crème fraîche, onion and 3/4 of the chives. Carefully lift the asparagus out of the water and drain well. Place one buffer on each plate, spread asparagus and 2 slices of ham evenly on each. Place the remaining buffers on top. Spread crème fraîche on top and serve sprinkled with the remaining chives and pepper.