Pre-heat an oven to 550 degrees. Line a tray with rock salt and place mussels on top. In a food processor, add the garlic, parsley, and olive oil. Puree until smooth and season with fleur del sel and black pepper. Transfer to a bowl and fold in with panko. Generously top each mussel with the topping. Squeeze a little lemon juice on each one and place in the oven. Change the oven to high broiler and cook mussels until brown on top, about 4 to 5 minutes.
Serve on a platter covered with more rock salt and garnished with parsley sprigs.
Copyright 2000, Ming Tsai and Tom Berry, All Rights Reserved