The secondary mash is based on the primary mash. To make the secondary mash, the primary mash is mixed with hard-cooked glutinous rice, nuruk and water and is put in a jar for the secondary fermentation process of 10 days. The ratio of hard-cooked glutinous rice to the primary mash to the brewing water is 8:3:6.
Godubap made of glutinous rice is added to the primary mash
Godubap made of glutinous rice is added to the primary mash
For the secondary mash, the rice is not boiled all at once. Eighteen liters of rice is added to the steamer each time the steam goes off. When the rice is properly steamed, the godubap is spread on a straw mat to cool.
When cooled, the godubap is added to the primary mash and brewing water. In a jar, nuruk powder is spread on the bottom. The mixture is then put inside and nuruk powder is again spread on top. The jar is covered with a blanket and kept at a constant temperature of 28 to 30 degrees Celsius.
The sound of carbon dioxide bubbling up is heard during the first three days of the secondary fermentation process. Afterward, the sound grows weaker and the swollen-up mash collapses. The completion of the first phase of the secondary fermentation process is indicated by the formation of a ring around the inside of the jar where the mash was most swollen. When the first-phase fermentation is complete, the jar is shifted for 10 days to a spot with a cool breeze for the second phase of the fermentation process.