1 cup butter 1 cup finely chopped celery 1 cup finely chopped carrots 1 cup finely chopped onion 1 cup all-purpose flour 1 teaspoon mustard 8 cups chicken broth 1 12 oz. can beer -- preferably flat 2 cups shredded Cheddar cheese 3 tablespoons freshly grated Parmesan cheese chopped fresh parsley 1. In a large soup pot over medium heat, melt butter. Add celery, carrots, and onion; saut