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Prepare the strawberries: Hull and slice the berries, toss with 3 tablespoons sugar and lemon juice. Set in a bowl and let macerate for at least 20 minutes (or up to 1 hour) while you make the biscuits.
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Preheat oven to 400°F. Line a baking sheet with parchment paper.
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Make the biscuit dough: Whisk together flour, sugar, baking powder, and salt. Cut in cold butter using a pastry cutter or fingertips until mixture resembles coarse breadcrumbs with some pea-sized pieces remaining.
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Add cold buttermilk and vanilla, stirring gently with a fork until dough just comes together. Do not overwork — the dough should be shaggy and rough.
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Pat dough on a lightly floured surface to 3/4 inch thick. Cut into 6-8 squares or rounds. Place on baking sheet and brush tops with beaten egg.
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Bake 12-15 minutes until golden brown. Let cool slightly on a wire rack.
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While biscuits bake, whip the cream: Beat cold heavy cream with powdered sugar and vanilla until stiff peaks form. Keep cold until ready to serve.
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Assemble: Split each warm biscuit in half. Spoon macerated strawberries (with their syrup) onto the bottom half. Top with whipped cream, set the biscuit top on, and crown with more berries and cream. Serve immediately.