1cupdried black soybeans (seoritae, 서리태)or yellow soybeans
2tablespoonsrice wine (or mirin/mirim)
2tablespoonsoligodang (올리고당), or rice syrup (조청)or corn syrup
1/2teaspoonroasted sesame seeds - optional
Rinse the dried soybeans a couple of times. Drain. Soak the beans in 2 cups of water for 2 - 3 hours or until the beans are softened. (The time required may vary depending on the beans.)
Pour the beans and soaking water in to a medium size pot. Bring it to a boil. Continue to cook, uncovered, over medium high heat for about 10 minutes. Stir a couple of times so the beans don't stick to the bottom of the pot.
Add the soy sauce, rice wine, and sugar. Reduce the heat to medium. Boil, uncovered, until the sauce is mostly evaporated and reduced to a couple of tablespoons, about 20 minutes, stirring occasionally. (Keep your eyes on the pot during the last few minutes to avoid burning the beans.)
Add the syrup, stirring well to coat for a minute or two before turning the heat off. Sprinkle with the optional sesame seeds. The beans will be soft at first, but they will get a bit chewier in the fridge.
Kongjang will keep well in the fridge for up to 2 weeks.