Try this! I could live off this stuff.
saute 1 bar butter, 1/2 tsp celery salt, black pepper, cayenne pepper, minced 3-4 cloves garlic, 1/3 cup worchester, and 3-5 twigs rosemary with a little olive oil.
Pour over 2 lb uncooked, unshelled shrimp and marinade 12-24 hours
bake at 400 for around 15 min or pink. don't overcook.