Boil egg in boiling water for about 10 minutes until hard. Rinse cold and peel. Wash herbs, dab dry, pluck leaves from the stalk and chop. Put stock and herbs in a pot and bring to the boil.
Remove from the heat and puree with a blender. Add cream and sauce thickener and bring to the boil again. Season to taste with salt and pepper. Chop the egg. Cut trout fillet into pieces.
Pour soup into cups. Add the trout and some chopped egg and serve sprinkled with chive rolls and garnished with dill, dill flowers and pimpinelle.