A great combo of blueberries and cranberries makes this a crimson delight. This was one of the very first recipes I ever developed for Bon Appetit Magazine and it remains, to me, one of my best efforts (well, in terms of pie).The blueberries are sweet and tame the tartness of the cranberries. In the end, you have a deeply crimson filling, that is tart, sweet, holiday-ish and kissed with a touch of orange. Another great pie choice is our Bumble Berry or Crumb Topped Apple Spice Pie.