How to Make It
In a large heavy pot, heat the butter over medium heat until hot, stir the onions, carrots, celery, 3/4 teaspoon salt, and 1/2 teaspoon pepper and cook, stirring occasionally, until golden, 8 to 10 minutes. Stir in the chicken, stock, and rice, then bring to a gentle boil. Cook the soup, stirring occasionally, until the chicken is cooked through and the rice is tender and opened, about 40 minutes. Stir in the pasta and cook until al dente. Season the soup with salt and pepper to taste and serve topped with the parsley.