Preheat the oven to 425℉. Line a baking sheet with parchment paper.
In a large bowl, toss the pears and cranberries together to combine. In a small bowl, whisk the sugar, cornstarch, cinnamon, ginger, and salt to combine. Add the sugar mixture to the fruit and toss to combine.
On a lighly floured surface, roll out half of the dough into a circle 1/4 inch thick. Add the filling in an even layer in the center, leaving 1 to 1 1/2 inches of uncovered dough all the way around at the edges.
On a lightly floured surface, roll out the second piece of dough into a circle 1/4 inch thick. Place it on top of your galette, and trim away any excess dough from the edges.
Fold your top piece of dough under the bottom piece of dough, and crimp as desired (you can use any type of traditional pie crimp for this!). Be sure to really crimp well—if the two crusts are not sealed well, filling may leak out during baking.
Egg wash the dough evenly all over, and sprinkle with turbinado sugar. Cut vents into the top crust.
Bake until the crust is golden brown and the filling is bubbling through the vents, 33 to 38 minutes.
I always have three kinds of hot sauce in my purse. I have a soft spot for making people their favorite dessert, especially if it's wrapped in a pastry crust. My newest cookbook, The Book on Pie, came out on November 10th, 2020, and my pie merch collaboration with Food52 is out now too: https://food52.com/shop/merchants/manifest-food52/food52-x-erin-mcdowell