Created by ForeverMama on December 8, 2017
Step 1: Heat oven to 475°. Rinse chicken under cold water; pat dry with paper towels. Peel lemon, avoiding white pith. Finely chop lemon peel, sage, and garlic together; place in a bowl. Add butter and 1 tsp. salt. Stir to combine. Quarter the peeled lemon; set aside.
Step 2: Using your fingers and a small, sharp knife, loosen skin of chicken from breasts and thighs. Slip butter mixture between skin and flesh, spreading it evenly. Rub skin with oil; season skin and cavity with salt and pepper to taste. Stuff with quartered lemon, parsley, and 1 quartered onion. Tie legs together with kitchen twine, if you like.
Step 3: Put remaining quartered onion and carrots into center of roasting pan and place chicken on top of them. Roast for 20 minutes, then reduce oven temperature to 400˚. Continue roasting until an instant-read thermometer inserted into thickest part of thigh (without touching bone) reads 165°, about 1 hour more. Transfer chicken to a platter; sprinkle with fleur de sel; let rest for 10 minutes before carving.