"Buttermilk adds a great tang to this mildly sweet, smooth, and custardy pie with a deep chocolate flavor from chef Deborah VanTrece...."
INGREDIENTS
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1 Tbsp. sugar
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1 tsp. Diamond Crystal or ½ tsp. Morton kosher salt
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1¼ cups (156 g) all-purpose flour, plus more for surface
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½ cup (1 stick) chilled unsalted butter, cut into ½" pieces
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½ cup chilled buttermilk
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4 large eggs
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1½ cups (300 g) sugar
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1 cup buttermilk
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½ cup (1 stick) unsalted butter, melted, cooled
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2 tsp. vanilla extract
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⅓ cup (39 g) Dutch-process cocoa powder, preferably Ghirardelli
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¼ cup (31 g) all-purpose flour
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½ tsp. Diamond Crystal or ¼ tsp. Morton kosher salt
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Whipped cream (for serving)