PREPARATION
Combine Knorr® Chicken flavor Bouillon Cubes with hot water; set aside.
Arrange tomatoes, tomatillos, onion, garlic and serrano chili in bottom of aluminum foil lined broiler pan in single layer. Broil, turning once, until blackened and very tender, about 10 minutes; cool slightly.
Peel tomatoes and garlic. Seed serrano chili, if desired. Process vegetables with their juices in blender or food processor 30 seconds. Add anise and pulse until smooth, adding 1/2 cup bouillon mixture, if needed.
Heat oil in 4-quart saucepot over medium-high heat and cook vegetable puree, stirring occasionally, until thickened, about 5 minutes. Stir in remaining bouillon mixture and mushrooms. Bring to a boil over high heat. Reduce heat to low and simmer partially covered, until flavors are blended, about 30 minutes.
