Always rinse your bird with cold water, especially the center cavity. I like to sit the bird on top of paper towels to drain after rinsing it while I do all my knife work.
Once you have sliced your onions, cut your celery, and sliced the carrots, you can season the inside of your bird with a pinch each of kosher salt and pepper. Fill the cavity with 2 slices of yellow onion, 2 sprigs each of Rosemary and thyme, as well as the lemon halves and the garlic cloves.
At this point, I like to truss the legs together with butchers twine or simply make a small incision in the fatty skin between the thigh and the end of the breast. Once you have made the incision, cross the legs of the bird, and stretch the skin over the opposite leg and slip the knuckle through the incision. This will hold the bird together during roasting.
Place the remaining onion slices, celery, and carrots in the roasting pan, and set the bird on top of them.
Take the remaining rosemary and thyme and chop it. Add it to the olive oil and mix. Drizzle the oil mixture over the bird, and gently massage it all around the bird. Sprinkle with the salt and pepper, and the bird is ready to go into the wood burning oven. Place the roasting pan in the center of your wood burning oven with the breast meat facing the embers and close the door.
You'll want to rotate the pan 15-20 minutes through the cooking processes, at which time you may choose to add the lid to your Dutch oven. Using a stem thermometer, check the temperature of your bird by sticking the thermometer into the thickest part of the breast and the thickest part of the thigh where it connects to the carcass. You want an internal temperature of 165º F. Pay attention to the liquid that comes out of the bird when the thermometer is removed. It should be clear. If it is pink, your bird needs a few more minutes.
Once the bird has reached the desired temperature, remove it from the oven and allow to rest on a warm surface for 5 minutes. Remove the bird from the pan and set it on a clean cutting board. Season the roasted vegetables with sea salt and place them on a serving platter. Cut the chicken into the desired number of pieces, and arrange them on top of the roasted vegetables. Drizzle with any remaining drippings and serve it up!