Martha Stewart, and I thought I'd post it up as I've got far too few desserts on here. This dish is also worth a try as the crust on this pie is lovely, courtesy of the cornmeal.
1/4 cup all-purpose flour, plus more for work surface
1/2 recipe Cornmeal Pate Brisee
1 pound rhubarb, sliced 1/2-inch thick
Juice of 1/2 lemon
3/4 cup granulated sugar
Pinch of salt
Pinch of ground, cinnamon
Pinch of freshly grated nutmeg
1 large egg, beaten
Caster sugar for dusting
1 tablespoon vegan margarine, cut into small pieces
Preheat oven to 375 degrees. Line a baking sheet with parchment paper; set aside.
On a lightly floured work surface, roll out dough to a 14-inch round, about 1/8-inch thick.
Place rhubarb and lemon juice in a large bowl; toss to combine. In a medium bowl, whisk together flour, sugar, salt, cinnamon, and nutmeg until well combined. Add sugar mixture to rhubarb and toss until well coated. Arrange rhubarb mixture on top of dough, leaving a 2-inch border all the way around. Fold border over the fruit mixture, overlapping where necessary and pressing gently to adhere the folds. Brush edges of dough with egg, sprinkle with turbinado or sanding sugar, and dot with butter. Transfer to refrigerator and chill 15 to 20 minutes.
Bake until crust is deep golden brown and juices are bubbling, 55 to 60 minutes. Transfer baking sheet to a wire rack to cool the galette. Serve warm or at room temperature.