Make the mignonette sauce: In a small bowl, stir together vinegar, sugar, shallots, and lemon zest. Season with a pinch of salt and freshly ground black pepper.
Marinate: Let sit for 30 minutes for the flavors to meld.
Finish and serve: Just before serving the oysters, stir in the chopped herbs of your choice. Serve the oysters on ice with the mignonette sauce in the middle and lemon wedges scattered throughout.
