Preheat your oven to 350°F (175°C). Place the unbaked pie crust into a 9-inch pie dish and gently press it into place.
In a large mixing bowl, whisk together the eggs and sugar until well combined. Add the cornmeal or flour, vanilla extract, and vinegar, stirring until everything is incorporated.
Pour in the melted butter and mix until the filling becomes smooth and evenly combined.
Carefully pour the prepared filling into the unbaked pie crust, spreading it evenly.
Bake for 45–50 minutes, or until the top is golden brown and the center is slightly set.
Remove the pie from the oven and place it on a wire rack. Allow it to cool for approximately 2 hours before slicing and serving.