It is made by soaking glutinous rice in water, boiling, pouring it into a vat, and then adding red yeast to start fermentation. After 30 days the liquor is ready to be consumed.
老酒是黃酒的一種，以糯米浸泡、蒸煮、落壇，加上紅麴發酵，只要三十天就可出酒。