In a 4- 6 quart soup pot add the bacon and cook until almost done over medium-high heat. Add the onions, celery and chopped carrots and cook for 5-6 minutes.
Allow the roux to cook over low heat for 5- 7 minutes, but don’t let the roux get dark or burn. Heat the stock in a saucepan, then add the hot stock to the roux and mix well using a wire whisk.