Rub pork on all sides with garlic; sprinkle with paprika. In a large skillet, brown the pork in butter. Add the mushrooms, lemon juice, marjoram, salt and pepper. Turn meat to coat with seasonings. Cover and simmer for 25-30 minutes or until a meat thermometer reads 160° and juices run clear. Remove meat and keep warm.
In a small bowl, combine the flour and cold water until smooth; stir into the pan juices. Bring to a boil; cook and stir for 2 minutes or until thickened. Slice the pork; serve with gravy and rice.