The soybeans are washed then boiled until they are soft. After boiling, the excess water is drained off and the beans are left to cool. The beans are then transferred to a bamboo basket lined with fresh slamet leaves. The leaves are then wrapped over the beans and hot charcoal is placed on top before more leaves are wrapped over once again. The entire basket is then placed inside a jutebag to ferment for three to four days by a fireplace. When the fermentation is complete, the beans are taken out and crushed in a mortar and pestle.