Lemon Shrimp

2 lbs (1 Kg) large shrimp
1/2 cup (125 ml) olive oil
1/2 cup (125 ml) chopped fresh parsley
1/4 cup (60 ml) fresh lemon juice
2 tsp (10 ml) 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. Cook the shrimp on a hot grill for 3 to 4 minutes per side. Serve immediately. Serves 4 to 6.