Make curry paste following the recipe instructions. Set aside.
Place all vegetables in a roasting pan. Drizzle with 1 tablespoon oil. Season with salt and pepper. Toss to coat. Set aside.
Rinse chicken under cold running water. Pat dry with a paper towel. Season the cavity with plenty of salt and pepper.
Place lemon and rosemary in the cavity of the chicken.
Cover the chicken with the curry paste. If you have time, cover and marinate in the refrigerator for at least 2 hours.
Tuck the wings under the chicken. Tie legs with kitchen twine.
Place chicken on top of the vegetables in the baking pan. Bake for about 1 hour or until juices run clear and chicken is cooked through. Ideally, the thigh part of chicken should register a temperature of 165 F or 75 C on an instant-read thermometer.
If breast starts to brown before chicken is fully cooked, cover loosely with aluminum foil.