Preparation Stir vinegar and salt in medium bowl until salt dissolves. Mix in green onions, shallots, garlic and black pepper. Let stand at room temperature 30 minutes. Season to taste with additional salt, if desired. (Can be prepared 2 days ahead. Cover and refrigerate.) Stir parsley into vinegar mixture. Line platter with crushed ice. Arrange oysters atop ice. Spoon 1 teaspoon vinegar mixture over each oyster. Transfer remaining vinegar mixture to small bowl. Serve oysters with lemon wedges and remaining vinegar mixture.
Preparation Stir vinegar and salt in medium bowl until salt dissolves. Mix in green onions, shallots, garlic and black pepper. Let stand at room temperature 30 minutes. Season to taste with additional salt, if desired. (Can be prepared 2 days ahead. Cover and refrigerate.) Stir parsley into vinegar mixture. Line platter with crushed ice. Arrange oysters atop ice. Spoon 1 teaspoon vinegar mixture over each oyster. Transfer remaining vinegar mixture to small bowl. Serve oysters with lemon wedges and remaining vinegar mixture.