The meat is washed, dried and coated on all sides with a mixture of mustard and black pepper (part of the mixture is maintained). The oil is heated in a glass container 1 minute at 600 W, place the meat, cover and held for 30 minutes at 180 Deut. In the middle of the baking turns smeared with the rest of the mixture and re-capped. It was then allowed to stand for 10 minutes, kept at a warm place. Juice to the cooking add cleaned and cut into two chapters water onion and white wine and was capped without being held 5 minutes at 600 Deut. Add peeled and coarsely chopped tomatoes, the court was capped and held for 1 1/2 minutes at 600 Deut. Half of onions and tomatoes are all removed and also put in a warm place. The remaining onions blending, add the tomato puree and pour the sauce into a bowl of sauce. Hold for 30 seconds at 600 Deut. Sliced ​​meat served with vegetables and sauce served separately in sauce-boat.