Original recipe found here.
2 russet potatoes peeled and cut into 1/2-inch wedges
Coarse salt to taste
1 whole chicken (about 6 pounds)
3 garlic cloves, thinly sliced
12 stems of fresh thyme, plus more for garnish
2 lemons, 1 thinly sliced and 1 halved
3 tablespoons olive oil
1 tablespoon butter
Freshly ground pepper, to taste
1. Preheat oven to 375 degrees. Cook potatoes in simmering salted water until just tender, 2 to 3 minutes. Drain.
2. Place chicken in a roasting pan, breast side up. Scatter potatoes, garlic, 6 thyme stems, and 1/2 of the lemon slices around chicken. Dot potatoes with the butter divided into small pieces.
3. Stuff chicken cavity with 1 lemon half and 3 thyme stems. Rub the olive oil all over the skin.
4. With your fingers, loosen skin from chicken breasts. Push remaining lemon slices and thyme stems under skin in a single layer. Squeeze juice from remaining lemon half over chicken and potatoes, and season with salt and pepper.
5. Roast, turning potatoes 2 or 3 times, until a meat thermometer inserted into thickest part of chicken thigh registers 160 degrees, about 1 1/2 hours. Let stand for 15 minutes. Garnish with thyme sprigs.
Grilling lemons can achieve the same effect as roasting. Thinly slice or quarter the fruit, toss with olive oil, and grill until lightly charred and softened. Squeeze over food, or serve as an edible garnish.