Put some parsley aside for garnishing. Wash the rest of the parsley and dill, dab dry and pluck the leaves or bunting from the stalks. Finely chop the flags and leaves. Mix salad cream, yoghurt, milk, parsley and dill.
Season to taste with salt. Wash potatoes thoroughly and cook in boiling water for 15-20 minutes until firm to the bite. Cook eggs in boiling water for 8-10 minutes. Clean and wash the salad and drain thoroughly.
Peel, wash and roughly grate the carrots. Peel and chop the onions. Drain eggs and potatoes and chill. Drain tuna and divide into layers. Finely chop the walnuts. Mix carrots and walnuts.
Coarsely grate the potatoes and mix with the cheese. Cut the eggs into slices. Layer salad, carrots, potato and cheese mixture, onions, tuna and egg in matching tall glasses. Put some salad cream between each layer.
Garnish with parsley.