Cut steak into 1 cm strips. Coat with salt and pepper. Drop into the bottom of a crock pot with onion. Mix garlic salt, worcestershire sauce, bouillon, and ketchup. Pour over the meat. Cover and cook on low for 6 to 8 hours or until tender. Turn control to high. Add wine and mushrooms. Dissolve flour in small amount of water. Add to meat mixture, stirring until blended. Cook on high for 15 minutes or until slightly thickened. Stir in sour cream; turn off heat. Serve with rice or noodles.