Sake kasu
Encyclopedia
are the lees
Lees (fermentation)
Lees refers to deposits of dead yeast or residual yeast and other particles that precipitate, or are carried by the action of "fining", to the bottom of a vat of wine after fermentation and ageing. The yeast deposits in beer brewing are known as trub...

 left over from sake production. It can be used as a pickling
Pickling
Pickling, also known as brining or corning is the process of preserving food by anaerobic fermentation in brine to produce lactic acid, or marinating and storing it in an acid solution, usually vinegar . The resulting food is called a pickle. This procedure gives the food a salty or sour taste...

 agent, a cooking paste to add flavor to food and as a marinade
Marination
Marination is the process of soaking foods in a seasoned, often acidic, liquid before cooking. The origins of the word allude to the use of brine in the pickling process, which led to the technique of adding flavor by immersion in liquid...

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