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1
Make crust: Combine dry ingredients in a stand mixer. Add butter and beat with paddle attachment on low speed, scraping bowl as needed, until pieces are raisin-size. With mixer still on low speed, drizzle in 1 tbsp. ice water; beat until pastry comes together, 1 1/2 to 3 minutes. Form 1 1/4 cups into a disk and the rest into a smaller disk.
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2
Preheat oven to 375u00b0 with rack on bottom rung. On a lightly floured board, roll larger disk into a 12-in. circle. Loosen with a long metal spatula, gently roll around a rolling pin, then unroll into a 9-in. pie pan (if dough cracks, press back together). Fold edge under, so it's flush with pan rim, then crimp. Chill 15 minutes.
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3
Roll remaining dough into an 11-in. circle. With a cookie cutter, cut out as many shapes, such as squares, as needed to cover most of pie. Set cutouts on a baking sheet; chill 15 minutes.
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4
Make filling: Stir together cornstarch and granulated sugar in a large bowl. Add berries with juices and toss to coat. Arrange evenly in pie shell. Lightly brush pastry cutouts with water and sprinkle with coarse sugar. Arrange cutouts over filling.
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5
Bake pie until filling bubbles and pastry is golden in center, 55 to 60 minutes (up to 1 1/2 hours if berries were frozen); if edge starts to get dark, cover with foil, and if pie starts to bubble over, put a rimmed pan underneath it.
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6
Let cool on a rack to room temperature, at least 3 hours.
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7
*Find sparkling sugar with the baking supplies.
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8
Note: Nutritional analysis is per serving.
