Cut the Lyoner, Emmental, paprika, cucumber and radish and the mushrooms into fine strips.
Finely dice 1 onion and mix together in a salad bowl.
Mix the sour cream with the mustard, stir in the cucumber liquid and vinegar, 2/3 of the finely chopped herbs and spices. A splash of Maggi rounds everything off. Mix everything together with 2 tablespoons of oil.
Pour the salad dressing over the salad and mix everything well. Let it steep for 1 hour.
Cut tomatoes and hard-boiled eggs and garnish the salad with the remaining herbs before serving.
A fresh baguette or farmhouse bread goes well with it.