3 cherry pie with pistachio topping Recipes

all-purpose flour, whole oats, ground to a flour in a food processor(yielding 1/2 cup oat flour), sugar, ground cinnamon, kosher salt, shelled unsalted whole pistachios , coarsely ground in a food processor or chopped medium fine by hand, unsalted butter, melted and cooled, sugar, cornstarch, kosher salt, fresh sour cherries, pitted , or 2 lb frozen sour cherries, partially thawed

granulated sugar, cornstarch, sour cherries, whole, pitted (fresh or frozen ), vanilla extract, pie crust (pastry dough for 9-inch ), pistachio nut, shelled, all-purpose flour, butter, cut into chunks, brown sugar