The village of Le Mesnil-sur-Oger is situated in the center of the famous Côtes de Blancs where the wines produced from chardonnay are entitled to Grand Cru status and known as blanc de blancs or white wine from white grapes. Le Mesnil (as it is referred to by the locals) is one of the best-known villages in the Côtes des Blancs and is host to a number of great champagne producers, one of whom is Bernard Launois. Bernard Launois is one of a number of generations of Launois producing great wines from their own vineyards and, as many of the better small champagne houses, a member of the "grower-producer" club meaning that the producer owns the vineyards, produces the still wines and then the champagnes on their own property. Thus the champagne from Launois Père & Fils (father & sons) is a unique wine showing the characteristics of the terroir of their vineyards as well as the style of the house.

Bernard Launois calls this Grand Cru bottling his Cuvée Réservée. The champagne is 100% chardonnay and is kept in the cellar for three years following the secondary fermentation. This extended ageing on the lees of the yeast gives the wine its complexity and nuttiness and provides a rich balance with the fruit and acidity coming from the chardonnay grape.

As most of the chardonnay-based champagnes from this region, the still wine does not undergo malolactic fermentation thus preserving the freshness of the fruit and giving the wine some ageing potential in the bottle.

This richly flavored blanc de blancs is an excellent aperitif and an excellent accompaniment to light hors d'oeuvres. It also goes well with seafood, shellfish lobster and crab as well as white meats and lightly seasoned poultry.