Clean mushrooms, wash if necessary. Peel and finely dice onions. Wash and halve the tomatoes. Clean, wash and dry lamb's lettuce
If necessary, wash the escalopes and pat them dry. Fry in hot oil in a coated pan (with lid) for about 3 minutes on each side. Season with salt and pepper, keep warm. Fry mushrooms and half onions in hot frying fat for about 5 minutes. Season with salt and pepper. Sprinkle with flour and sauté briefly. Stir in 1/4 l water, condensed milk and 2 teaspoons broth. Bring to the boil and simmer covered for 4-5 minutes. Season to taste with salt and pepper
Wash and finely chop the parsley. Boil up about 5 tbsp. water, vinegar, rest of onions and 1/2 tsp. broth. Season with salt and pepper, let cool down. Mix with tomatoes and corn salad. Arrange schnitzel and mushroom sauce. Sprinkle with parsley. Add salad. Serve with boiled potatoes