I have been making the same blueberry pie recipe for years and it's the standard berries, sugar, cornstarch, lemon zest, butter recipe. For some reason the last two times I've made it, the liquid syrup does not develop while it's baking. I'm using frozen Whole Food blueberries but the pie comes out of the oven dry! As a friend of mine says, Whiskey, Tango, Foxtrot?
Any suggestions as to what I could add to make the syrup?