Peel and finely dice the onions and garlic. Clean, wash, quarter, seed and dice the tomatoes. Heat 2 tablespoons of oil in a saucepan, fry onions until translucent, add garlic, basil and tomatoes, fry over low heat for 10-12 minutes. Wash the meat and dab dry with kitchen paper. Whisk the egg with a fork in a deep plate. Mix breadcrumbs and Parmesan cheese and also fill into a deep plate.
Turn escalopes first in flour, then in egg and finally in breadcrumbs and parmesan. Heat the remaining oil in a large frying pan and fry the escalopes in it over medium heat for 3-4 minutes on each side. Then season with salt and pepper. Arrange schnitzel and tomato sauce on plates and serve garnished with basil as desired. Serve with baguette or ciabatta