Peel the garlic and press it through a garlic press. Peel and finely dice the onion. Mix sour cream, mustard cream, vinegar and garlic. Season to taste with salt and pepper. Peas from the pods and cook in little boiling salted water for 2-3 minutes (defrost frozen peas).
Pour off, quench and drain. Wash the salad, dab dry and cut into bite-sized pieces. Grate 3/4 parmesan finely and mix with breadcrumbs. Whisk eggs and season with a little salt and pepper.
Wash the schnitzel, dab dry and cut in half. First turn in flour, then in egg and finally in Parmesan cheese mixture. Press the breadcrumbs lightly. Heat oil in a pan. Fry the cutlets for 3-4 minutes on each side until golden brown.
Chop the rest of the Parmesan cheese into strips. Mix salad, peas, onion and salad cream. Arrange salad and schnitzel.