Joint the whole chicken into eight pieces. With a heavy knife, cut the chicken backs into smaller pieces. Add chicken and backs to a large pot and cover with cold water, then place over high heat. Once boiling, drain over a colander, discarding the water. Return the blanched chicken to the pot with the remaining soup ingredients, cover with cold water (at least 3 quarts) and return to high heat.
Once the soup reaches a boil, lower the heat to a gentle simmer. Cook for six hours, skimming often and topping up with water as required to keep everything submerged.
Gently strain the soup through two layers of cheesecloth. For best results, refrigerate the soup overnight, or for up to three days. This will allow you to discard the solid fat risen to the surface, resulting in the clearest possible soup.
When ready to serve, reheat the soup and add salt to taste.
In a separate pot of boiling salted water, blanch the baby onions, carrots and celery until just tender. Trim the celery into eight bite-sized pieces. Place one of each vegetable into eight warm bowls. Add a large ladle of soup, then drizzle generously with Flamingo Estate Garlic Olive Oil.