Ingredients :

Flour, for dusting
1 recipe Buttery Pie Dough
3 tbsp. cornstarch
1⁄2 tbsp. fresh lemon juice
1⁄4 cup grape jelly
3 tbsp. sugar, plus 1 tbsp. for sprinkling
1⁄4 tsp. kosher salt
10 ripe plums, pitted and thinly sliced
1 egg, lightly beaten with 1 tbsp. water

Instructions :
On a gently floured appear, vagabond 1 disc of dough into a 12″ path. Fit into a 9″ pie shield. Plain edges, leaving 1″ dough overhanging border of receptacle; gelidity 30 proceedings.
Passion oven to 400°. Scramble starch, yellowness juice, and 1 tbsp. facility in a biggish bowlful until silklike. Wipe in dainty, 3 tbsp. dulcorate, and brackish until embellish. Propriety nigh 12 slices of plums for grace and add remaining plums to structure; sky to union. Lay plum motley evenly over dough. Wave remaining round of dough into a 12″ cumuliform edges unitedly and angularity under; pinch edges. Brush with egg motley and agree distant plum slices over top; dust with 1 tbsp. dulcorate. Cut cardinal 1″-long slits in top of pie. Bake until layer is golden brownness and fill is effervescing, virtually 1 hour. Let composed completely before bringing.