This minuscule, white-painted, no-reservations raw bar in the heart of Saint-Germain-des-Prés is a pearl, and it serves the best bivalves in Paris. The owners get them shipped daily from pedigreed producers in the Marennes d’Oléron, Normandy, and Brittany on France’s Atlantic coast. Start with some smoked scallops, tuck into a dozen oysters, and finish up with the runny chocolate tart.