Heat oil in a Dutch oven (or a large, wide pot) over medium-high heat. Add sausage, breaking it up with a spoon, and cook 4 to 5 minutes, until sausage is slightly browned. Reduce heat to medium, add celery, onion, thyme and sage, and cook, stirring, about 5 minutes, until vegetables are soft. Stir in butter, Kitchen Accomplice Chicken Broth Concentrate or Chicken Bone Broth Concentrate, and water, bring the mixture to a simmer, then remove from heat.