Heat oil in a Dutch oven over medium heat. Add onion, carrot, and celery; saute until onion is translucent, 8 to 10 minutes. Add chicken, salt, and pepper; cook and stir for 2 to 3 minutes. Add garlic, ginger, turmeric, and red pepper flakes; cook and stir until fragrant, about 1 minute.
Increase heat to medium-high and pour in chicken broth; bring to a boil.
Reduce heat to medium, cover, and simmer until chicken is no longer pink in the center and the juices run clear, 8 to 10 minutes. Remove chicken to a plate and shred when cool enough to handle.
Increase heat to medium-high and bring to a boil. Add orzo and cook, stirring occasionally, until tender yet firm to the bite, 8 to 10 minutes.
Remove and discard parsley stems; roughly chop leaves. Stir parsley into the soup with shredded chicken and vinegar. Adjust seasonings and ladle into bowls.
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