The main ingredients of Doenjang are sea water and "Meju". The basic way to make Doenjang is to take Mejus and put them into big jars with sea water. Bad bacteria and odor are removed by adding charcoal and sun-dried chili peppers. Liquid is then taken out to make Korean soy sauce. This sauce takes about 20 to 30 days to make. The Mejus are taken out from the jar and tempered. Salt and soy sauce is added on this paste and the paste is put in jars again. After sun-drying for several days, it becomes Doenjang.