Creamy Asparagus Soup
["1/2 c. chopped onion", "1 c. sliced celery", "3 cloves garlic, pressed", "3 Tbsp. butter or margarine, melted", "2 (14.5 oz.) cans cut asparagus (undrained)", "1 (16 oz.) can sliced potatoes, drained*", "1 (14 1/2 oz.) can ready to serve chicken broth", "1 tsp. white vinegar", "1 tsp. salt", "1/2 tsp. ground black pepper", "1/4 tsp. ground red pepper", "1/2 tsp. dried basil", "1 c. milk", "1/2 c. sour cream (optional)", "celery leaves (garnish)"]
["Cook first 3 ingredients in butter in a Dutch oven over medium-high heat, stirring constantly, until tender.", "Stir in asparagus and next 7 ingredients.", "Bring to a boil, stirring often. Reduce heat and simmer 10 minutes, stirring often.", "Cool slightly. Pour half of mixture into container of an electric blender; process until smooth, stopping once to scrape down sides.", "Transfer mixture to another container.", "Repeat procedure.", "Return asparagus mixture to Dutch oven.", "Stir in milk; cook just until thoroughly heated (do not boil).", "Dollop each serving with sour cream and garnish, if desired.", "Yield:", "2 quarts."]
["onion", "celery", "garlic", "butter", "potatoes", "ready", "white vinegar", "salt", "ground black pepper", "ground red pepper", "basil", "milk", "sour cream", "celery"]