- Add the chicken and water to the pot of an Instant Pot. Secure the lid and set the valve to seal.
- Cook on manual high pressure for 35 minutes, or cover and simmer stove top for 1 hour. Release the pressure and remove the chicken.
- Discard the skin and the bones and shred the chicken with 2 forks. Set aside.
- Strain the liquid through a mesh sieve into a bowl. Set aside.
- Heat the oil in the pot on high sauté mode for the Instant Pot, or medium-high on stovetop.
- Saute the onions for 3 to 5 minutes, until they’re nearly translucent. Season with salt and pepper and stir in the leeks. Saute for 5 to 7 minutes, until well browned.
- Add the carrots, celery, garlic, and potatoes. Saute for 3 minutes longer, then add the reserved broth and chicken, and season with salt and pepper.
- For Instant Pot – secure the lid and cook on high pressure for 1 minute. For stove top, cover and simmer for 15 minutes. Remove the lid, stir in the parsley, thyme, dill, lemon zest, and lemon juice. Season to taste with salt and pepper.
Freeze in individual portions for 6 months. Refrigerate for 7 days.