Mixed Berry Pie for Pi Day

I searched for a good recipe for a mixed berry pie in an attempt to approximate the deliciousness of the “Merry Berry” pie from the farm stand near my parents’ home on Long Island. This one is adapted from the Open-Faced Blueberry Pie from Epicurious; my version uses half fresh blueberries and half frozen mixed berries and fresh tangerine juice instead of lemon juice (and I use my own pie crust recipe). Yum. Happy Pi Day!