Peel, remove cores, and slice the apples.
Preheat oven to 425°F. Prepare one unbaked pie crust by rolling and fitting it into a 9" pie plate.
Squeeze lemon juice over the apples and toss to prevent browning.
Add sugar, flour, nutmeg, cinnamon, and salt to the apples and toss to combine well.
Pour apple mixture into a prepared, unbaked pie crust.
Cut butter into small pieces and place over the top of the apple mixture.
Roll out second unbaked pie crust and center over the top of the pie. Seal top and bottom crusts together around the edges.
Sprinkle the top of the pie with additional sugar, if desired. Cut slits (or a cute shape) into the top of the pie to allow the steam to escape while cooking.
Bake for 40-50 minutes, until the pie is bubbling and the crust is golden brown. Protect the crusts of the pie with strips of aluminum foil to prevent them from over-browning.
Allow pie to cool completely before slicing. Serve with vanilla ice cream or whipped cream.