BTI (Better Than Ina's) Roast Chicken and Vegetables

Insert your fingers between the chicken skin and the breast to loosen the skin around the meat. It feels kinda dirty, but you’ll like it. Slip half the butter mixture underneath the skin, trying really hard not to rip the skin. Halve the zested lemon and stuff the halves inside the chicken’s cavity along with 5 of the whole garlic cloves and the herb sprigs. Slather the chicken with the rest of the herb butter. Arrange the carrots, parsnips, onion, and remaining 10 whole garlic cloves in a 9"-x-13" baking dish (see note) in a single layer. Season the vegetables with a few pinches of salt and place the chicken on top, breast-side down. Roast the chicken until it’s super golden and the skin is crisp, 1 hour 30 minutes to 1 hour 45 minutes, basting with the juices in the pan every 15 minutes. (This way the skin on the chicken’s back will be golden and the skin on the breasts will remain soft, but the breast meat will stay super juicy. If you want golden skin all around, carefully flip the chicken for the last 30 minutes of roasting.)