1Discard any broken-shell or open (dead) mussels that do not close when tapped. Scrub remaining mussels, removing any barnacles with a dull paring knife. Remove beards by tugging them away from shells.
2Place mussels in large container. Cover with cool water. Agitate water with hand, then drain and discard water. Repeat several times until water runs clear; drain.
3Heat gas or charcoal grill. In tightly covered container, shake remaining ingredients. Cover; refrigerate until serving.
4Place mussels on grill over medium-high heat. Cover grill; cook 5 to 7 minutes or until mussels open, removing mussels as they open. Discard any unopened mussels. Place mussels on serving platter; drizzle with oil mixture.