For most chicken soups, I make the stock from scratch and shred the chicken back into the broth at the end. For a diverticulitis-friendly version, that step gets cut.
Strain the broth carefully so no chicken pieces end up in the soup. Diverticulitis flares need easy-to-digest, low-residue food, and even small chunks can irritate. The flavor stays rich because the depth comes from the stock itself, not the meat.
Put water in a large pot, add the chicken legs, and boil for 10 minutes.
Chop the carrots, zucchini, and potatoes into cubes, then add them to the chicken broth. Add salt, stir, and cook for 20 more minutes.
Put 5 tbsp of plain Greek yogurt in a medium bowl. Add the yolk of 1 egg and the juice of half a lemon, then mix well. Add 2 spoonfuls of chicken stock to the bowl and stir.
Take the chicken out of the pot.
Slowly add the dressing to the pot, mixing as you go. Turn the stove to medium heat and cook for another 5 minutes. After 5 minutes, add pepper and the juice of 1 lemon, then mix again. Bring to a brief boil and it's ready.
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Notes
Tip: When the dressing has warmed to roughly the soup's temperature, slowly stir a small amount into the pot. Otherwise the yogurt will curdle and look flaky. Recommendation: If you prefer a less sour soup, use juice from half a lemon instead of the whole lemon in the last step. Warning: Never add chicken pieces to the soup, they're not suitable for this diet.