In a large frying pan, heat up the oil and fry the meat until browned all sides.
Add the butter, onion, tomatoes and mushrooms and cook stirring for around 5 minutes or until the onion is translucent.
Add the rice and stir well.
Add the beef stock, salt, pepper, sugar, olives and paprika.
Simmer for around 5 minutes.
Pre heat the oven at 190 °C. Transfer the content of the pan into a baking dish and bake for around 30 minutes.
Sprinkle with the parsley and pepper before serving.