What labor-intensive process is mandated for producing Crémant de Luxembourg bubbles?

Answer

Secondary fermentation occurring within the bottle

The production of Crémant de Luxembourg must adhere to the traditional method, which is identical to the intensive process utilized for crafting Champagne. A cornerstone requirement of this method is that the secondary fermentation, the phase responsible for creating the wine's characteristic effervescence and fine bubbles, must take place directly inside the individual bottle before it is released for consumption. This technique is crucial for imparting the complexity and fine mousse that contribute to its high esteem. Furthermore, the grapes used for this sparkling wine must be hand-harvested, adding another layer of labor intensity to its production standards.

What labor-intensive process is mandated for producing Crémant de Luxembourg bubbles?
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