"Nokdumuk" is a special type of Korean dish that is made from boiled and ground soybeans. It's kind of like a jelly that is white in color and has a firm and slippery texture.
To make nokdumuk, first, you take some soybeans and soak them in water for a few hours. Then you grind them up into a fine paste and add some more water before cooking them in a pot on the stove.
Once the soybean mixture starts to thicken and bubble, you scoop it out into a large flat pan and let it cool down. When it is completely cooled, you cut it into thin squares or triangles and serve it chilled.
Some people add spices or seasoning to nokdumuk to give it more flavor, while others enjoy eating it plain. It's a popular dish in Korean cuisine and is often served as a side dish or as a component in a larger meal.