Finely dice the leek / onion and fry in 2 tablespoons butter, add the finely diced garlic. Add the rice and cook with it.
As soon as all the rice grains are coated with fat, pour on the wine. Then add the hot broth. Season the risotto with salt and pepper and simmer gently. Stir it again and again.
As soon as the rice has absorbed most of the broth, stir in the saffron and continue cooking for a few minutes. Stir in the remaining butter and parmesan and let simmer while stirring until the parmesan and rice combine to a creamy consistency.