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1. First, chop the onion and prepare a marinade of mustard and ketchup, then season with salt and pepper.
Fruits and vegetables
2. Then cut the meat, but do not cut it completely, and spread the marinade between the slices.
3. Carefully place the meat in a baking dish and bake, covered, at 200°C (390°F) for 50 minutes to 1 hour.
4. Now add the whipping cream and sour cream and cook, uncovered, for another 15 minutes. Done!
