Fill a large platter with crushed ice. Place the seafood and lemons artfully on top of the ice. Serve with the sauces.
Mustard Sauce:
Yield:1 1/2 cups
Combine all the ingredients and serve with the seafood.
Mignonette Sauce:
Yield:1/2 cup
Place the shallots, vinegar, and sugar in a small saucepan and bring to a boil. Cook uncovered for 1 minute. Remove from the heat and allow to cool to room temperature. Add the pepper and herbs and serve with the raw oysters.