Directions:
Mix reserved liquids from oysters and mushrooms and measure 3/4 of a cup; set aside.
Make sauce with butter, flour, garlic, onion, Worcestershire, celery seed, and liquid. Add mushrooms, shrimp and sherry.
Pat oysters dry and place each in a cleaned half shell. Place shells on a cookie sheet or broiler pan. Sprinkle with Parmesan and cover with sauce. Sprinkle with paprika and broil 5 to 8 minutes until bubbly.