Put rice in 1/2 litre of boiling salted water, bring to the boil, cover and let it swell at low heat for about 20 minutes. Put deep-frozen spinach and 200 ml water in a pot, cover and let thaw at medium heat for about 16 minutes.
In the meantime, wash parsley, dab dry and chop except for a little bit for garnishing. Wash the tomatoes, dab dry, cut in half and remove seeds. Cut tomato halves into cubes. Peel onion and garlic.
Dice onion, press garlic through a garlic press. Heat the fat in a pot, sauté the onion and garlic in it, add the tomatoes and braise briefly. Add defrosted spinach, season with salt, pepper and nutmeg and simmer for 2-3 minutes.
Wash the steaks and pat them dry. Heat oil in a pan and fry the steaks for 3-4 minutes, turning them over. Season with salt and pepper and remove from the pan. Dissolve the meat with stock, stir in the sauce thickener and bring to the boil again briefly.
Mix rice and parsley and arrange on plates together with the steaks, sauce and spinach. Serve garnished with parsley.