Preheat oven (electric cooker: 200 °C/circulating air: 180 °C/gas: see manufacturer). Line baking tray with baking paper. Wash potatoes thoroughly, cut in half and mix with sesame and oil. Season with salt and pepper. Spread on the baking tray and bake in a hot oven for 30-40 minutes.
Mix sour cream, milk and tahini. Wash the asparagus and cut the ends off generously, cut the stalks in half lengthwise. Wash chervil, shake dry, pluck off leaves (do not throw away stems!).
1⁄4 l Bring salt water and chervil stems to the boil in a wide pot. Steam the asparagus for about 6 minutes. Boil eggs in boiling water for about 7 minutes. Sort spinach, wash and shake dry. Clean, wash and thinly slice radishes. Cut the cress from the bed.
Rinse the eggs cold, peel and halve them. Arrange potatoes, radishes, spinach, asparagus and eggs. Add sauce. Sprinkle with chervil leaves and cress.