On a lightly floured surface, roll out the dough to ¼- to ⅛-inch thick. Transfer the dough to a pie dish. Tuck the excess overhang of dough under itself. Use your fingers to create a fluted shape or simply use a fork to crimp the edges. Poke the base of the crust with a fork a few times. Chill the dough in the refridgerator 30 minutes.
Preheat the oven to 425F.
Pour the custard carefully over the asparagus, peas, and ricotta. Brush the edges of the quiche with the beaten egg.