Peel and finely dice the onions and garlic. Heat butter and oil in a pot, fry onion and garlic over low heat until transparent. Add rice and sauté briefly. Season with pepper. Add broth bit by bit, stirring from time to time. Add the next portion of liquid only when the rice has absorbed the liquid. Cook for a total of 30-35 minutes
Put 100 ml water and spinach in a pot. Cover and bring to the boil over medium heat. Simmer for about 2 minutes, stirring several times. Wash chives, shake dry and cut into fine rolls. Grate Parmesan finely
Mix spinach with liquid, chives and 50 g Parmesan cheese into the risotto. Season to taste with salt and pepper. Serve the risotto in small bowls sprinkled with the rest of the Parmesan