Preheat your oven to 350°F (180°C). Prepare the capon by removing any giblets and patting it dry with paper towels.
Rub the capon with olive oil, then season generously with salt and pepper. Gently slide the truffle butter under the skin, distributing it evenly.
Halve the lemon and place it inside the capon, along with the garlic cloves and fresh thyme sprigs.
Place the roughly chopped carrots, celery, and onions on the bottom of a roasting pan. Pour in the chicken stock.
Place the capon on top of the vegetables and roast for 1.5-2 hours, or until the internal temperature reaches 165°F (74°C). Baste the capon with the pan juices occasionally during roasting.
Remove the capon from the oven and let it rest for 15 minutes before carving.
Strain the pan juices and serve as a sauce alongside the carved capon. Serve with the roasted vegetables.
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