Quinoa is not traditionally used in aguadito but it makes the soup filling and healthy. You really have to love coriander (cilantro) to like this soup but, if you do, this is really lovely and very easy to make. I used leftover roast chicken but take a look at the notes for an alternative.
Instead of cooked chicken you can add 2 raw chicken breasts in with the quinoa (step 4) and simmer until cooked. Remove, shred and add back into the soup before serving.