Risotto alla milanese - Trois fois par jour

Ingredients

• 1 teaspoon saffron
• 3 tablespoons butter
• 1 small onion, finely chopped
• 1 1/2 cup Arborio rice
• 2/3 cup white wine
• 4 cups vegetable broth
• 1/2 cup Parmesan cheese, freshly grated (or more, to taste)
• Salt and pepper, to taste