Make the pie crust

• Prepare the pie crust at least two hours in advance so it can rest before starting the filling. Add the flour, sugar, orange zest and salt to the bowl of a food processor. Pulse until combined.

• Add the butter and pulse until it appears like split peas. Sprinkle the cold water on top and continue to pulse just until it looks like cottage cheese.

• Tip the dough onto a clean work surface. Press the dough into a large disc, wrap tightly in plastic wrap, and refrigerate for at least two hours, and up to three days. 

Make the filling

• Combine the sugar and cornstarch in a large saucepan. Add the cherries, cranberries, lemon juice, orange zest, vanilla, salt, cinnamon and ginger and stir to combine. 

• Cook over medium high, stirring often, until the cherries and cranberries break down and the fruit becomes jam-like and thickens, about 10 minutes.

• Remove from the heat and stir in the two tablespoons of butter. Set aside to cool slightly while fitting the pie crust into the pie pan. 

Putting it all together

• Remove the disc of dough from the refrigerator. Use a sharp knife to divide it into two. Return one half to the refrigerator. Roll the other half into an 11-inch round on a lightly floured work surface. Transfer the dough to a pie plate and press it into the plate. Refrigerate for at least 30 minutes.

• Remove the second round of dough from the refrigerator and roll into a round that’s ¼-inch thick. If making a lattice crust, cut the dough into strips (I like using 2-inch strips).  Place on a baking sheet and return the strips of dough to the refrigerator. 

• Heat the oven to 375 F. Remove the crust-lined pie plate from the refrigerator. Pour in the filling. Remove the strips of dough from the refrigerator and weave into a lattice crust design. Crimp the pie crust edges together. 

• Whisk the egg well. Brush the egg on the strips and the crust in a thin, even layer (you will have some left over). Generously sprinkle the demerara sugar on top. Bake until the pie filling is bubbling over the crust, 40-45 minutes. 

• Remove the pie from the oven and let cool completely at room temperature, which will allow the filling to thicken. Serve with a scoop of ice cream.