Add the olive oil to a large pot over medium heat and cook the onion, celery, salt, pepper, cayenne and basil for about 5-6 minutes or until the onions are translucent. Add in the garlic and stir an additional 45 seconds before adding in the broth, tomatoes and sugar. Transfer to you vitaclay pot.
Set on Stew or fast to cook for 30 minutes.
Blend perfectly smooth with an immersion blender.
Add in the heavy cream, mix well and serve using more heavy cream and parsley as garnishes.