When ready to cook, start the Traeger grill on Smoke with the lid open until the fire is established (4 to 5 minutes). Set the temperature to 450 degrees F and preheat, lid closed, for 10 to 15 minutes.
Using 1 Tbsp olive oil, lightly grease a large sheet tray and spread chicken feet and bones out evenly. Roast for 90 minutes turning occasionally until the bones are golden brown.
While these are roasting, place the onion, celery and carrots on a separate sheet tray and toss with remaining olive oil. Roast alongside the bones for 25 minutes until lightly caramelized.
Place the contents of the sheet pan in a large roasting pan making sure to scrape up all the browned bits.
Add the roasted vegetables, garlic, bay, peppercorns, parsley and thyme to the pan and fill with enough cold water to cover the contents.
Adjust the temperature on the grill to 250 degrees F. Partially cover the roasting pan with lid or foil, and place directly on the grill grate. Cook for 6-8 hours, occasionally skimming excess oil off the top.
Using a large slotted spoon or spider skimmer, gently fish out the bones and discard. When all the large pieces have been removed, strain the stock through a fine mesh sieve into another large roasting pan.
Return the pan to the grill and cook an additional 3-4 hours or until reduced and thickened enough to cover the back of a spoon. Enjoy!
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