Preheat oven to 400°.
Combine the first 7 ingredients in a bowl; stir well with a whisk.
Place a 1-inch-thick layer of rock salt (about 3 pounds) in the bottom of a Dutch oven. Place the pan in oven at 400° for 30 minutes or until rock salt is very hot. Arrange shrimp in a single layer over rock salt. Cover and bake at 400° for 2 minutes. Turn shrimp over, and bake for an additional 2 minutes or until done. Serve the shrimp with vinaigrette.