Sake Kasu (酒粕) or "sake lee" is the leftover by-product from the fermenting and refining process of sake. Sake lee can be purchased in all Japanese supermarkets and is used to marinate vegetables, meat, fish and pickles. This sake lee is from the traditional "ISHII Sake Brewery" in Kanagawa prefecture. It can be used to make delicious "Narazuke": a typical type of tsukemono pickles.