Risotto alla Milanese

Name: Risotto alla Milanese
Ingredients: 2 cups Carnaroli fine rice (not parboiled); 5 cups vegetable broth; 3 tablespoons butter at room temperature; 1/3 cup Parmesan cheese grated; 3 medium shallots very finely chopped; 2 teaspoons bone marrow; 1/4 cup white wine; 2 pinches saffron threads (keep a little for decoration); white pepper freshly ground; salt