Preheat your Kamado Joe Classic Joe to 425ºF, set up for indirect grilling.
Melt the butter in a Lodge Logic 10” cast iron skillet. Add the onions, carrots and celery. Season with Cattleman’s Grill California Tri-tip Seasoning. Sweat the mirepoix over medium-low heat until softened, about 10-15 minutes.
Add the flour and cook for a couple of minutes longer, stirring frequently. Continue stirring as you add one cup of stock. Adjust the consistency with extra stock, as needed. Add the turkey, frozen corn and frozen peas and stir to incorporate. Remove from heat.
Top the skillet with the pie dough. Score some vents on the surface. Whisk the egg and brush on the dough. Bake until golden brown and bubbling, about 45 minutes.