Risotto Milanese

Ingredients

• • 4 beef bone marrow, about 1 1/2-inch (3-cm) thick
  • 8 cups (2 litres) chicken broth
  • 1/2 teaspoon (2.5 ml) saffron threads
  • 1/4 cup (60 ml) butter
  • 1 onion, finely chopped
  • 2 cups (500 ml) Arborio rice
  • 1 cup (250 ml) white wine
  • 1 cup (250 ml) grated Parmigiano-Reggiano cheese
  • Salt and pepper