Place a large soup pot over medium heat and add the olive oil.
Once simmering sauté the onions, celery, and garlic for about 5 minutes, or until translucent.
Add in the rest of the ingredients, stir well to combine, and bring to a boil.
Reduce to a simmer, and cook for 30 minutes.
Taste and adjust for salt and pepper.
Serve with freshly grated parmesan cheese on top and fresh parsley.
