Cut steak into one-inch cubes. In paper bag, place 1/2 c flour, salt and pepper. Shake cubes of steak until dusted. In lg skillet, melt 1/6 lb butter. When hot, add cubes of steak and lightly brown them. Remove steak and to pan add onions, diced finely, minced garlic, marjoram, tomatoes, wine and paprika. Cook slowly with lid on skillet for 15 minutes. Add the steak, replace lid and cook slowly until steak is tender, 45 minutes to 1 hour. Stir in sour cream and serve.