To start the soup, heat a large, heavy-bottomed pot over medium-heat. Add the olive oil followed by the pancetta. Cook it until it is light-golden in color.
Add the carrots, celery and onion along with a pinch of salt. Sweat the mirepoix (you may have to turn the heat down slightly) for about 8 to 10 minutes or until the vegetables soften but do not brown. Add the garlic and cook until it starts to soften and release its aroma (do not let the garlic brown either).
Next, add the chopped tomatoes, bouquet garni and the parmesan rind, followed by the
vegetable stock or
chicken stock. Bring the soup to a simmer and let cook for about 15 minutes, stirring occasionally.