Start by preparing your chicken stock. Wash the carrots and celery sprigs. Peel the onions. Roughly chop all the vegetables.
Place the chicken (cut in parts) and the chopped vegetables into a large pot. Cover them completely with water.
Season generously with salt and pepper. Bring the mixture to a boil, then reduce the heat to low and let it simmer for about 1 hour. This slow simmering will extract all the delicious flavors and reduce the liquid.
Once the stock has simmered, carefully remove the chicken and vegetables from the pot. Discard the overcooked vegetables.
Strain the chicken stock through a fine-mesh sieve into another clean pot or bowl. This will ensure your stock is clear and free of any solids. Set the clear stock aside.
Once the cooked chicken is cool enough to handle, remove the meat from the bones and shred it into small pieces. Set the shredded chicken aside for later.