Blood Orange Polenta Olive Oil Layer Cake with Orange Mascarpone Filling
  . Winter is the premier, peak growing season for citrus.  Luscious lemons, tangy limes, and fragrant oranges.  Southern Italy is known for blood oranges, considered by many to be some of the world's finest dessert oranges.  These oranges can be recognized from other oranges by first glance at their skin's red-blushed color.  Once opened,