Preheat oven to 350°F; line a baking sheet with parchment paper; set it aside.
Combine steak, potato, carrot, rutabaga, onion, salt, pepper and thyme in a large mixing bowl; set aside.
Roll pie crust dough into 4 8-inch crusts.
Spoon filling mixture on half of each crust.
Place one tablespoon of butter on top of filling.
Fold dough over to form half circles; crimp the edges.
Whisk egg with one tablespoon of water; brush each pasty with egg wash; vent crusts with a fork.
Bake ~45 minute, until golden brown.