What term refers to sake that is unpasteurized?

The term that refers to unpasteurized sake is "nama-zake." This type of sake is distinctive because it has not undergone the pasteurization process that typically stabilizes and enhances the flavor profile of the beverage. As a result, nama-zake tends to have a fresher, more vibrant flavor and a smoother texture, often showcasing the raw ingredients' natural characteristics.

The process of pasteurization in sake is usually done to eliminate certain microorganisms and to preserve the shelf life of the product. However, the unpasteurized version maintains some of the live yeast and enzymes, which can contribute to a slightly effervescent quality and a pronounced aroma.

Other terms may refer to different aspects of sake production. For instance, "kikizake" refers to sake that is specially selected for tasting, often by professionals or sommeliers. "Kimoto" is a traditional method of making sake that involves a labor-intensive starter mash production technique. "Shikomi" specifically describes the fermentation process where the koji mold, yeast, and water are combined with rice to create sake. While all these terms are related to sake, they do not specifically denote unpasteurized sake like nama-zake does.