What is the fine-grained topic of the following text: The latest innovation is the ‘6 Cépages’ made from the six permitted grape varieties in Champagne: the well known Chardonnay, Pinot Noir and Pinot Meunier, with the addition of Pinot Blanc, Arbane and Petit Meslier. Only return the topic.
Innovation in Champagne Making with Six Permitted Grape Varieties