Dough for single-crust pie
1 cup sugar
3 large eggs
1/2 cup buttermilk
1/2 cup unsalted butter, melted and cooled
2 tablespoons all-purpose flour
1-1/2 teaspoons vanilla extract
1-1/2 cups sweetened shredded coconut
Preheat oven to 325°. On a lightly floured surface, roll dough to a 1/8-in.-thick circle; transfer to a 9-in. pie plate. Trim to 1/2 in. beyond rim of plate; flute edge. Place pie plate on a rimmed baking sheet.
In a large bowl, beat sugar, eggs, buttermilk, melted butter, flour, vanilla and salt until blended. Stir in coconut. Pour into crust. Bake until top is light golden brown and center is almost set, 50-60 minutes. Cool on a wire rack; serve or refrigerate within 2 hours.