Pat the thawed Tegel Frozen Whole Chicken dry with paper towels and then place the chicken in a roasting tin. Season the chicken all over with salt and pepper, including inside the cavity. Place the white onion, lemon and a few sprigs of thyme in the cavity and truss the legs with twine.
Drizzle olive oil generously all over the skin of the chicken then sprinkle over some thyme leaves.
Place the chicken in the oven and cook for 1 ½ hours total or until juices run clear when a skewer is inserted into the thickest part of the thigh.
Halfway through cooking, add the potatoes to the baking tray.
After an additional 15 minutes, add the kūmara, pumpkin, carrots, red onion and garlic. Make sure the vegetables are in a single layer and turn them once during cooking.
Toss the broccoli florets in a little oil and add to the baking tray for the last 15 minutes of cooking.
Once the chicken is cooked, transfer it to a serving plate, cover loosely with foil and allow to sit 10 minutes before carving. Let the roasting vegetables continue to cook in the oven while the chicken rests, if necessary.
Make 1 cup of gravy according to the packet instructions. You can use pan juices to make the gravy if you like.
Serve the chicken with the roasted vegetables and a jug of gravy.