How to Make It
In a large saucepan, heat the oil over moderately low heat. Add the onions, carrots, and celery and cook, stirring occasionally, until the vegetables start to soften, about 10 minutes. Stir in the broth, tomatoes, tomato paste, potatoes, green beans, and salt. Bring to a boil. Reduce the heat and simmer, partially covered, until the vegetables are almost tender, about 20 minutes.
Stir in the egg noodles. Bring the soup back to a simmer and cook until the vegetables and noodles are tender, about 5 minutes. Stir in the parsley.
Feel free to mix and match vegetable combinations according to what you like and what you have on hand. Other excellent soup vegetables include: fennel, celery root, cabbage, parsnips, turnips, peas, zucchini, squash, shredded greens, corn, lima beans, and bell peppers.