Petterino's Tomato Bisque

We visited Chicago this past summer and our hotel, the Cambria Suites, located in the Loop was across the street from Petterino's.  We ran in there for lunch the after we checked into our room and were setting off on an afternoon and evening of sightseeing.....
Petterino's was amazing!  The Monday lunch special is a Toasted cheese and bacon sandwich with tomato bisque.  We all agreed, the tomato bisque was delicious and the highlight of our lunch.
Here's the recipe that I was able to find online: 

Creamy Tomato Bisque

3 large onions, sliced

3 ounces olive oil

2 ounces fresh garlic, minced

1/2 cup red wine vinegar

5 ounces dry sherry wine

4 tablespoons chicken base

5 ounces brown sugar

2-1/2 quarts heavy cream

1-1/2 quarts water

2 (22-ounce) cans stewed tomatoes

3 ounces unsalted butter

Salt and pepper to taste

1 tablespoon basil chiffonade

Chopped parsley and croutons for garnish

* In a stainless steel pot, sauté onions in olive oil until they are soft. Add garlic and sauté an additional 2 to 3 minutes.

* Add red wine vinegar, sherry, chicken base and brown sugar and cook until the liquid is almost gone.

* Add the rest of the ingredients and simmer for 30 minutes.

* Use a hand mixer and blend the soup until smooth. Check seasonings for taste.

* Add basil and serve, garnished with parsley and croutons.

* Makes 2 gallons soup.