PROBLEM TO BE SOLVED: To provide a method for producing an alcoholic beverage using purple potatoes in which the color and flavor of purple potatoes are more felt are used as raw material, and to construct a system in which waste is not generated as possible by effectively utilizing sake lees exhausted in the production process of the alcoholic beverage.SOLUTION: Provided is a method for producing an alcoholic beverage comprising: a step where rice malt or potato malt are added with water and yeast, and fermentation is caused to obtain a fermentation liquid； a step where purple potatoes in the weight of 5 to 20 times the fermentation liquid and water are added to the fermentation liquid, and fermentation is caused to obtain purple potato fermented unrefined sake； and a step where the purple potato fermented unrefined sake is subjected to solid-liquid separation to obtain an unrefined sake liquid part and an unrefined sake solid part, and the unrefined sake liquid part is utilized as an alcoholic beverage.SELECTED DRAWING: Figure 1【課題】紫芋の色と風味がより感じられる紫芋を原料としたアルコール飲料の製造方法を提供するとともに、該アルコール飲料の製造過程において排出される酒粕を有効に利用して廃棄物が極力出ないシステムを構築することを課題としている。【解決手段】米麹又は芋麹に水と酵母を加えて発酵させて発酵液を得る工程と、前記発酵液の５～２０倍の重量の紫芋と、水とを、前記発酵液に加えて発酵させて紫芋発酵醪を得る工程と、前記紫芋発酵醪を固液分離して醪液部と醪固形部を得る工程とを含み、前記醪液部をアルコール飲料として利用した。【選択図】図１
