Korean black beans, often called kongjaban, are glossy, sweet-savory soybeans simmered in a seasoned sauce until tender and lightly sticky. They are commonly served chilled or at room temperature as a Korean banchan, or side dish, alongside rice and other small dishes; this home-style version balances soy sauce, sugar, and a little sesame.
Ingredients
- 1 cup (190 g) dried black soybeans (seoritae or black soybeans)
- 4 cups (950 ml) water, for soaking
- 3 cups (710 ml) water, for simmering
- 1/3 cup (80 ml) Korean soup soy sauce or regular soy sauce
- 3 tablespoons (45 ml) rice syrup or corn syrup
- 2 tablespoons (25 g) granulated sugar
- 1 tablespoon (15 ml) toasted sesame oil
- 1 teaspoon toasted sesame seeds
- 1 small garlic clove, finely grated (about 1 teaspoon)
Instructions
- Rinse the dried beans in a sieve, removing any debris or shriveled beans. Put them in a large bowl and cover with 4 cups (950 ml) water. Soak for 8 hours or overnight in the refrigerator. Drain and rinse. The beans will expand, so use a generously sized bowl.
- Place the beans in a medium, heavy-bottomed saucepan with 3 cups (710 ml) fresh water. Bring to a boil over medium-high heat, skimming off any foam. Reduce the heat to maintain a steady, gentle simmer and cook uncovered for 40 to 50 minutes, stirring occasionally. Add a splash of water if the pan becomes nearly dry before the beans are tender. Start checking at 40 minutes: a bean should be soft enough to bite without a hard or chalky center.
- Stir in the soy sauce, rice syrup, sugar, and grated garlic. Simmer uncovered over medium-low heat for 15 to 20 minutes, stirring more often as the sauce reduces. The beans should look glossy and the liquid should be syrupy but still loose enough to coat them. Remember that the sauce thickens as it cools; do not cook it down until it is dry or tacky in the hot pan.
- Take the pan off the heat and stir in the sesame oil. Let the beans cool in the sauce for 15 minutes, then transfer them to a shallow serving dish and sprinkle with sesame seeds. Serve at room temperature or refrigerate until chilled. For food safety, refrigerate within 2 hours of cooking; do not leave the beans out while a meal is served for longer than that.
Tips
- Choose the right beans. Korean black soybeans have a dark skin and pale interior; they are different from small black turtle beans. Dried black soybeans give the traditional nutty flavor and firm, creamy texture. If you cannot find them, use regular dried soybeans; the result will be similar but not black. Turtle beans can be used in a pinch, but they taste earthier and soften differently.
- Soak for even cooking. An overnight refrigerator soak shortens the simmer and helps the beans cook evenly. If you are short on time, soak them in hot water for about 2 hours, then drain; they may still need extra simmering. Do not add salt or syrup before the beans have softened, as seasoning the cooking liquid too early can slow tenderizing.
- Adjust the finish, not the tenderness. Reduce the sauce only after the beans are soft. If it becomes too thick, stir in water a tablespoon (15 ml) at a time; if it is thin, simmer a few minutes longer. Soy sauces vary in saltiness, so taste before adding any extra salt.
- Use a low, steady simmer. A hard boil can split the skins and evaporate the water before the centers cook. Keep the pot uncovered and stir gently, especially once the syrup and soy sauce go in.
Serving Suggestions
Serve kongjaban as one of several banchan, with steamed short-grain rice, soup, and a main dish. Its sweet-salty flavor pairs well with simply grilled or pan-fried fish, tofu, or vegetables. Offer a small portion in a side dish rather than treating it as a large main course: the seasoning is concentrated, and a spoonful or two alongside rice is often enough. It can be served cold, at room temperature, or gently warmed.
Variations
For a less sweet version, reduce the sugar to 1 tablespoon (12 g) and the rice syrup to 2 tablespoons (30 ml); the beans will have a less lacquered finish. For a deeper, more savory sauce, replace the rice syrup with an equal amount of corn syrup, which is a practical substitute but has a more neutral flavor. You can also add 1 teaspoon (5 ml) of finely minced ginger with the garlic for a warmer aromatic note. A pinch of red pepper flakes adds mild heat, though it is not necessary for this classic sweet-savory style.
Storage and Reheating
Cool the beans promptly and refrigerate them in a clean, covered container within 2 hours of cooking. They keep for 3 to 4 days in the refrigerator. Serve them cold or bring a portion to room temperature shortly before eating. To warm them, place the amount you need in a small saucepan over low heat with a teaspoon or two of water, stirring until hot; microwave in a covered microwave-safe dish in short intervals, stirring between them. If reheating leftovers, heat to 165°F (74°C), the USDA FSIS safe temperature for reheated leftovers. Reheat only what you plan to serve, and discard any portion left at room temperature for more than 2 hours.
Frequently Asked Questions
Are Korean black beans the same as black turtle beans?
No. Kongjaban is traditionally made with black soybeans, often Korean seoritae. Black turtle beans are a different variety with a different flavor and texture. They can substitute in a pinch, but the finished side dish will not taste quite the same.
Can I make kongjaban without soaking the beans?
Yes, but expect a longer and less predictable simmer. Rinse the beans and cook them gently in fresh water until completely tender before adding the seasonings; this may take considerably longer than the 40 to 50 minutes listed here. Keep adding hot water as needed so the pot does not dry out.
Why are my beans still hard?
Older beans can take longer to soften, and a vigorous boil may evaporate the cooking water too quickly. Continue simmering in fresh water until the centers are tender, then add the soy sauce and sweeteners. If the beans are very old, they may remain firm despite extended cooking.
Can I use honey instead of rice syrup?
Yes. Use 3 tablespoons (45 ml) honey in place of the rice syrup. Honey adds its own floral flavor and may make the sauce taste slightly sweeter, so reduce the granulated sugar if desired. Corn syrup is more neutral and gives a similar glossy texture.
Should kongjaban be served hot or cold?
Either is fine. It is commonly served as a chilled or room-temperature banchan, but you can warm it gently if you prefer. Avoid boiling it again, which can make the sauce overly thick and the beans break apart.
Can I freeze the cooked beans?
Yes. Freeze cooled beans in an airtight freezer-safe container for up to 2 months for best quality. Thaw overnight in the refrigerator and warm gently with a small splash of water. The texture may be a little softer after freezing, but the beans remain suitable as a rice-side dish.
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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes
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