Preparation Place mussels in heavy large Dutch oven, cover and cook over high heat until mussels open, shaking pan occasionally, about 5 minutes. Drain mussels, reserving liquid. Transfer mussels to bowl; discard any that do not open. Tent bowl with foil. Melt butter in same Dutch oven over medium-high heat. Add shallots and garlic and sauté until tender, about 3 minutes. Add 3 tablespoons parsley, lemon juice, lemon peel and reserved liquid from mussels and bring to boil. Season to taste with pepper. Drizzle garlic butter over mussels. Sprinkle with 1 tablespoon parsley.