HORAIYA HONTEN SHOYU KOJI 340ML Horaiya Honten Koji Shoyu is made by adding fermented rice malt (Koji) to artisan soy sauce and left to mature further for 12 months. A sweeter and thicker finish than regular shoyu (Soy Sauce) that complements tofu, sushi and sashimi. Try seperating the koji rice grains and serving them on mackerel sashimi, amazing. For over 100 years Horaiya Honten have been producing koji in Japan using a traditional process. Koji related products are Horiaya Hontens speciality. Koji is rice surrounded by koji mould and is the first step in traditional Japanese fermented food. Other foods derived from koji include sake, miso and amazake. Koji is also used to pickle vegetables called Sagohachi.