Saute the rice in the pan over medium heat for 5 to 7 minutes, or until lightly toasted. Stir constantly so the rice will not stick and burn. Stir in one ladle of beef stock, and keep stirring until it is mostly absorbed, ladling and stirring in more of the broth as well as the white wine in the same manner, until the rice is almost al dente. Stir in the saffron, remaining butter, and 3/4 cup of Parmesan cheese. Turn off the heat, cover and let sit for 4 or 5 minutes.
