Chop the beef into small cubes. Sprinkle the soy sauce over the beef and mix in.
Heat the oil in a nonstick saucepan. Stir-fry the beef then season and set aside in a warm place.
Brown the chopped onions in the pan, add the cooked rice, sprinkle with the paprika and cook for a few minutes, stirring with a spatula.
Serve very hot with the cubed beef.