Numéro 3 is the name of this elegant restaurant, nestled in the Vallée de Chevreuse, which honors the products of the Yvelines region, regularly unearthed by Laurent Trochain, a chef with a passion for local produce. It's been 20 years since he and his wife earned their first star in a former inn, where they now treat us to "vi-gétale" cuisine... we'll take you there...