Heat a large dutch oven over medium high heat. Add oil.
When oil is hot, add onion, carrots, and celery. Sauté the vegetables until mostly tender, about 5 minutes, stirring frequently.
Stir in garlic, salt, thyme and oregano and cook for another minute or two.
Add stock and bring it to a boil.
Add orzo and cook until orzo is tender, about 10 minutes.
Stir in chicken, 1 tablespoon lemon juice, lemon zest, and Worcestershire sauce. Cook until chicken is heated through, about 3 minutes.
Add more lemon juice to taste, if desired. Salt and pepper to taste as well. Remove from heat and serve with fresh parsley, if desired.
Notes
Note 1: Homemade chicken stock is the best option. However, in a pinch I recommend to use "Better Than Bouillon" chicken base.Note 2: Leftover rotisserie chicken, or pre-cooked shredded chicken breast works great in this dish to save time. Or you can use raw chicken, but be sure to cook it with the vegetables in the first step of this recipe.