Shrimp Bisque
["3 1/2 lb. uncooked heads-on shrimp", "2 carrots, chopped", "3 celery stalks, chopped", "1 (3 oz.) pkg. crab and shrimp boil", "2 onions, each stuck with 6 whole cloves", "1/2 c. unsalted butter or margarine", "5 green onions, chopped fine", "1/4 c. minced parsley", "2 medium garlic cloves, minced", "1 medium onion, chopped", "1/2 lb. mushrooms, sliced", "1 bay leaf", "3/4 c. flour", "1 1/2 c. whipping cream", "1/4 tsp. freshly ground black pepper", "1/4 tsp. cayenne pepper or to taste", "salt to taste", "1/4 c. dry sherry", "chopped chives (if desired)"]
["Peel shrimp, reserving shells and heads.", "Cover and refrigerate shrimp until ready to use."]
["shrimp", "carrots", "celery stalks", "crab and", "onions", "unsalted butter", "green onions", "parsley", "garlic", "onion", "mushrooms", "bay leaf", "flour", "whipping cream", "freshly ground black pepper", "cayenne pepper", "salt", "sherry", "chives"]