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In a large saucepan, over high heat, brown the onion with the olive oil for about 1 minute. Add the carrots, celery and garlic and brown for 2 more minutes.
Add the chicken stock and water as well as the thyme, marjoram and rosemary. Season with salt and pepper. Bring to a boil, reduce heat slightly and simmer for 10 minutes.
In a large bowl, combine the turkey, breadcrumbs, Dijon mustard, garlic powder, salt and pepper. Mix well and shape into small meatballs with your hands, about half the size of a golf ball.
Add the meatballs and orzo to the stock, bring to a boil again and simmer for 10 minutes.
Adjust seasoning to taste with salt and pepper and serve.