Trim most of the visible fat off the chicken.
Place the chicken in a large pot and add 12 cups of cold water. Then bring to a gentle boil and you will see that white foam starts forming on top of the water. This is “scum”, or protein that is extracted from the chicken. Remove it with a small strainer or a spoon.
Simmer the chicken for about 30-45 minutes before adding the remaining ingredients.
While the chicken is simmering, clean and cut the vegetables into large pieces. Small carrots are fine whole, larger ones should be cut in half. I usually cut the leek in half lengthwise, clean it, put it back together and tie it with parsley stems using cotton kitchen twine – it’s easier to remove later.
Place the prepared carrots, parsnips, celery root, leek and parsley leaves in the pot together with bay leaves, allspice berries, black peppercorns and lovage (if using). Add 2 teaspoons of salt.
Simmer the soup for about 2-3 hours uncovered.
Strain the bone broth. Carefully remove the chicken (it will be falling apart) and set aside together with 2 carrots. Fish out all the remaining vegetables and discard. Then take a fine mesh strainer or a sieve, place in a second pot and strain the broth. This will help you catch all the spices and small pieces.
Taste the soup and see if it needs more salt. If yes, add another ½-1 teaspoon.
Using your fingers, take the chicken meat of the bones shredding or cutting into bite size pieces. Discard all bones and skin. Slice the cooked reserved carrots.
Boil the noodles in salted water according to package instructions. Drain and set aside.
Add cooked noodles, carrots and chicken to the pot. Sprinkle with chopped parsley leaves or dill and serve hot.