Get your frozen pie shells out of the freezer and let them thaw before baking
In the bottom of your instant pot, place all of the ingredients: onion and celery, beef, pork,oats, parsley, water, and all of the spices and herbs
Mix the ingredients up - make sure the meats are broken down as much as possible
Put the lid on your Instant Pot and set the timer to Meat/Stew for 20 minutes on High.
Do a slow release for 5-7 minutes, then a fast release for the rest of the pressure. Remove the lid and let stand for about 10 minutes. You want to do this because the filling will be piping hot and it makes it easier to put into the pie shell
Prick the bottom of the pie shells with a fork and put half of the filling in each pie shell and spread evenly.
With the two remaining pie shells, gently remove them from the pans, and roll them out on your baking mat.
Using the pie crust cutters, create fun designs to cover the tourtiere mixture. OR you put the entire crust on the top, crimp the edges using your fingers. MAKE SURE you cut a hole in the top crust for steam to escape.
Bake in the bottom third of the oven at 400F for 35 to 45 minutes or until the crust is golden. Let the pie stand for 5-10 minutes before serving. It will be piping hot! Each pie will serve 6 to 8 people.
To freeze your authentic tourtiere recipe: double wrap in aluminum foil and then place inside a zippered freezer bag to prevent freezer burn.