Chop onion and garlic.
Wash and prepare spinach.
Heat olive oil in a pan and sauté the onion and garlic.
Add spinach and cook until wilted.
Add rice and sauté together.
Add tomato purée and low-fat milk, then bring to a simmer.
Season with salt and pepper.
Stir and cook until the rice is done.
Turn off the heat and mix in Parmesan cheese.