2 pounds large shrimp
1/2 cup olive oil
1/2 cup chopped fresh parsley
1/4 cup fresh lemon juice
2 teaspoons dry mustard
4 cloves garlic, finely chopped
1 medium onion, finely chopped
Salt and freshly-ground pepper to taste

Using a small pair of scissors or kitchen shears, snip open the backs of the shrimp shells, leaving them on the shrimp.  Combine all the ingredients in a large bowl and toss to combine.  Marinate for 10 to 30 minutes, refrigerated.

Grill the shrimp on a hot grill for 3 to 4 minutes per side.  Serve immediately.

Serves 4 to 6.