Combine in a food processor the butter, garlic, shallots, lemon juice, Worcestershire, celery seeds, thyme, parsley, hot sauce, salt and freshly ground black pepper. Process until smooth. Hold cold until ready to use (may be done in advance). Before using, melt in a pot until it starts to bubble slightly, serve warm.
Wash clams thoroughly, let sit in cold water 15 minutes, then drain.Pre-heat grill on medium high heat. Place onto grill and cover with a pan or lid. Cook until clams they open, place on a serving tray and serve with sauce.