French chefs Samuel Desjobert (L) and Pierre Reboul add a finishing touch of liquid air to their fruit and olive oil cocktail, during "Lo mejor de la gastronomia", (The best of the gastronomy), a four day conference and trade fair promoting gastronomic techniques and products, with talks and culinary [demonstrations] by top chefs from around the world, in San Sebastian, northern Spain November 21, 2005.