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Season the meat with the salt, pepper and paprika. Set the thermostat to 130°C in Sauté mode and sauté the meat and onions in the oil. When golden brown, add the garlic cloves, tomato concentrate and flour.
Sauté for 2 to 3 minutes. Set the thermostat to 100°C in Braise mode. Add the beef stock and marjoram. Cook covered for one and a quarter hours.
Add water during the cooking if necessary. When the meat is almost cooked, add the potatoes. Serve hot with sour cream.