Preheat the oven to 400° F. Line a baking sheet with parchment paper.
In a large bowl, whisk the pumpkin, egg, brown sugar, cinnamon, ginger, nutmeg, clove, and crème fraiche to combine.
On a lightly floured surface, roll out the dough to 1/4 inch thick. Use a pastry wheel to cut it into a triangle shape. Transfer the dough to the prepared baking sheet.
Spoon the filling in the center, leaving 1 1/2 to 2 inches of uncovered dough all the way around. Fold in the sides of the triangle first to encase the filling. Then, fold the bottom piece of the triangle over onto the filling. Be sure to apply a little pressure at the corners where the edges of dough meet—make sure they’re sealed well or filling may leak out during baking!
Brush the edges of the dough with egg wash and sprinkle with pearl sugar. Bake until the filling is set and the dough is golden brown, 30 to 35 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