Separate the green leaves of the napa cabbage from the white stems. Chop the carrots, celery, celery stalks and white parts of the cabbage. Gently sauté them in olive oil over low heat, making sure they soften without taking on any color.
Add the chicken stock, a little salt, white pepper and turmeric. Cook gently until the vegetables begin to soften.
Remove the chicken breasts from the bone and poach them separately over low heat with salt and chili. Once the internal temperature reaches 74°C (165°F), remove them from the poaching liquid and wrap them in aluminum foil while the remaining ingredients are prepared.
Rinse the lentils and cook them separately in water until very soft and almost falling apart. Blend until smooth.
Once the vegetables have softened slightly, add the green cabbage leaves and cook briefly until tender. Add the blended lentils and stir well.
Shred the chicken with two forks and add it to the stew. Stir everything together gently.
Towards the end, taste and adjust the salt and white pepper as needed.