Preheat your oven to 325℉. Place your pie crust in a 9-inch pie pan, homemade or store bought is fine.
Toast pecans in a large saucepan and let cool.
In a bowl whisk together sugar, salt, and flour until combined.
Add milk then one by one add the room temperature eggs.
Stir in apple cider vinegar, vanilla, and melted butter. Mix until everything in fully incorporated.
Add the pecans to the filling then pour the filling into pie tin. Cover with aluminum foil and bake at 325℉ for one hour. Remove tin foil then bake for an additional 30 minutes.
Remove once the center is soft and slightly jiggly, it will firm up at the pie cools.
Let cool completely before cutting into.