Which sake is produced using the Yamahai method?

The Yamahai method is a traditional style of sake brewing that involves a specific technique for preparing the yeast starter, known as "Moto." This method allows for a natural lactic acid fermentation to occur, which contributes to the unique flavor profile of the sake produced through this technique.

Sake made using the Yamahai method tends to have a richer, more complex taste with distinctive aromas, often resulting in a fuller-bodied profile. This is particularly relevant for brewers seeking to create sake with depth and character.

The name of the method itself—Yamahai—literally reflects the process, making it directly identifiable as sake produced through this brewing style. The other options listed do not specifically correlate with the Yamahai method: Kijoshu refers to a type of sake made using a higher percentage of sake instead of water for dilution, Namadoko is typically associated with unpasteurized sake, and Ginjō denotes a premium sake that emphasizes a specific level of rice polishing rather than the brewing method itself. Thus, identifying the correct answer as Yamahai is supported by its direct association with this brewing process.