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1
Pulse egg yolks, both flours, baking powder, salt, and granulated sugar in a food processor to combine. Add butter and pulse until only pea-size pieces remain. Drizzle in 2/3 cup cream, then pulse 2-3 times to barely incorporate. Transfer dough to a work surface and gently fold on top of itself several times just to bring it together and work in any dry spots.
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2
Using a 2-oz. ice cream scoop, make 6 balls and place on a parchment-lined baking sheet. Do not flatten. (Or measure out mounded scoops with a 1/4-cup measuring cup.) Cover and chill until cold, 20-25 minutes.
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3
Preheat oven to 350u00b0F. Brush tops of shortcakes with remaining 2 Tbsp. cream and sprinkle with sanding sugar. Bake until golden and sides are firm to the touch, 28-32 minutes. Let cool.
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4
Toss strawberries, granulated sugar, lemon zest, and a pinch of salt in a medium bowl to combine. Transfer half of strawberries to a large saucepan and add 1 Tbsp. water; let remaining strawberries macerate while you bring strawberries in saucepan to a gentle simmer over medium-low. Cook, stirring occasionally and reducing heat if needed to keep at a low simmer, until strawberries are starting to break down and become jammy and liquid is syrupy, 12-18 minutes. Let cool, then stir in 1 tsp. lemon juice. Stir remaining 1 tsp. lemon juice into macerated strawberries.
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5
Combine heavy cream, powdered sugar, and a pinch of salt in a medium bowl. Scrape in seeds from vanilla bean; reserve pod for another use. Beat cream until soft peaks form.
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6
Split shortcakes and divide strawberry compote, macerated strawberries, and whipped cream among bottoms. Close with shortcake tops.
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7
Shortcakes can be baked 1 day ahead. Store airtight at room temperature. Reheat before serving.