Dice the onion and sauté in a saucepan. Add the rice and sauté briefly until the oil has disappeared. Always stir, otherwise the rice grains will burn quickly.
Add twice the amount of water, i.e. 4 coffee cups, and bring to the boil. Lower the heat to a low level and season with the broth, garlic and pepper. Simmer for about 20 minutes until the rice has soaked up the water.
Meanwhile, defrost the spinach in the pot and briefly bring to the boil. You can also use the creamed spinach. When the rice and spinach are ready, mix them together, mix in the finely diced feta or feta cheese and serve.