(Relaxnews) - If you are what you eat, then it could be said that chefs are what they cook. In an exclusive series from Relaxnews, some of the top chefs from around the world share their favorite food ingredient to prepare and eat, every week. Whether it be lemons, apricots, or sea urchin, the answers are as varied as the chefs themselves. The chef of Mas Candille in Mougins in the south of France, Serge Gouloumès, lets us in on the secrets of the blue eggplant.