1 1/4 cup pumpkin puree
4 tablespoons unsalted butter, melted
2 tablespoons fresh lemon juice (optional)
1/2 teaspoon freshly grated nutmeg
1/2 teaspoon ground cinnamon
1/2 teaspoon kosher salt
3 large eggs, separated
1/2 cup sugar
2 tablespoons all-purpoe flour
3/4 cup full- or lowfat buttermilk
1 pie crust (you can buy one, or make one)
Whipped cream, for serving
Preheat the oven to 375°F.
Combine the pumpkin puree, butter, lemon juice if using, nutmeg, cinnamon and salt and mix thoroughly with a wooden spoon or rubber spatula after each addition.
In a small bowl, beat the egg yolks lightly with a whisk, about 30 seconds. Add the sugar and beat until they’re a creamy lemon-yellow color, about 1 1/2 minutes. Add the egg mixture to the pumpkin mixture and stir until the eggs are thoroughly incorporated and the filling is a consistent bright orange color. Add the flour a little at a time, stirring after each addition until thoroughly incorporated. Add the buttermilk and again stir until smooth and even.
With a cleaned whisk (or electric hand mixer), whisk the egg whites to soft peaks in a clean, dry bowl. With a wooden spoon or rubber spatula, gently fold the egg whites into the pumpkin-buttermilk mixture until thoroughly combined. Pour the mixture into the crust and bake on the middle rack of the oven until the center is firm and set, 35 to 40 minutes.
Remove the pie from the oven and cool completely on a rack. Serve at room temperature (or cold from the fridge; you can cover it with plastic wrap before chilling) with a dollop of whipped cream.
Adapted from smitten kitchen’s sweet potato buttermilk pie.