Even though this dessert works for those who can’t eat gluten or dairy, it tastes as special as standard pies — maybe even more so. A toasty pecan press-in crust replaces a typical butter-flour dough and coconut milk gives the spiced pumpkin filling creamy richness. The fluff of a meringue topping delivers the airiness of whipped cream and the singed ridges offer the delightful bittersweetness of burnt marshmallow. To prepare this ahead, refrigerate the cooled baked pumpkin pie before the…