Preheat your oven to 350°F (175°C).
In a large bowl, whisk together the buttermilk, sugar, and eggs until smooth.
Add the vanilla extract and melted butter, mixing well.
Gradually incorporate the flour and salt into the mixture, stirring until combined.
Pour the filling into the unbaked pie crust, smoothing the top.
Bake in the preheated oven for 40-50 minutes, or until the filling is set and lightly browned.
Let the pie cool on a wire rack for at least 1 hour.
Once cooled, refrigerate for a couple of hours to enhance the flavor.
Before serving, sprinkle a pinch of ground nutmeg on top for added flavor.
Slice and enjoy your delicious buttermilk pie!