If you are not eating your pie immediately store either in the fridge or freezer, wrapped in plastic wrap. Your pie will keep in the fridge for up to one week, or in the freezer for up to one month.
Serve cold or at room temperature. If you would like to refresh your toasted marshmallow, stick the pie under the broiler in your oven for 5 minutes, or until it gets toasty brown. Alternately, if you have a kitchen torch, go ahead and torch the top until dark brown/black.