After 40 years at the helm of one of Provence’s most renowned restaurants, La Fenière, Chef Reine Sammut and sommelier husband Guy are handing over the reins of the cuisine to Nadia Sammut in October. Nadia, who is the third generation of Sammuts at La Fenière, credits her grandmother and her parents for her culinary knowledge and passion for food but brings her own personal experience and education to the table, too: growing up with celiac disease and learning to cook creatively sans gluten (and dairy, too!). The transition began a year ago, Nadia told me in a recent interview.   By July, when I dined…