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Drain the beans and put them in a large heavy pot. Add water that is three times as deep as the beans, cover, and cook over medium-high heat for 1 hour. Turn the heat down to medium and continue cooking until the beans are soft enough mash easily, 4½ to 5 hours, checking to make sure the beans remain covered with water, and replenishing as necessary. Drain the beans in a colander. Mash the drained beans to a paste in batches with a large mortar and pestle or in a food processor. Don't finely grind them, leave some beans half-crushed. Divide the mashed beans into 3 portions. Knead each portion with both hands and shape into a firm rectangular block measuring 6 x 3 x 4 inches.
Traditionally Koreans dry meju on the heated ondol floors of their homes, and if you live in Korea or have that kind of heating in your house, you can do that too. But in my NYC apartment I simulate ondol by putting an electric blanket on the floor. Line the blanket with a clean cotton cloth or waxed paper and set the blocks on top, or put them in an open basket. Set the heat to low. Dry the blocks, rotating them occasionally, until they are solid enough to hang, 3 to 4 days. Tie each block up in cotton twine and hang them. You can hang them outside but be sure to keep them covered and out of the rain, and if it's too hot out they may rot. Inside, you can hang them from the ceiling with hooks. Wherever they hang, the spot should be cool and well-ventilated and all sides of the blocks should be exposed to air and not touching each other. Let the blocks hang for 6 weeks, until they are well dried out and smell a little pungent when you get your nose close to them. Now it’s time to ferment the bean blocks. Place a layer of dried rice straw or hay in the bottom of a cardboard box that’s just big enough to hold the blocks with a little space between them; the straw will insulate the blocks and attract good bacteria like Bacillus subtilis in the air. (Don’t worry if you can’t find straw or hay; the blocks will still attract good bacteria.) Cover the box and put it on the electric blanket. Set the heat to low and let the bean blocks ferment for 2 weeks. At this point, the well-fermented bean blocks will smell a little earthy and pungent and will be covered with white, brownish-yellow, or sometimes greenish fungi. (These fungi change the bean proteins to peptides and amino acids, which will give the bean paste its delicious nutty flavor.) Tie the fermented bean blocks up in cotton twine and hang from the ceiling, as before, for 1 month.
Wash the blocks in cold water and to remove the fungi. Place the blocks in a shallow basket or on a baking sheet lined with waxed paper and let them dry in the sunlight for 1 day, turning them until every side of each block is dried. Combine the 3½ gallons water (56 cups) and 5 quarts of the kosher salt (20 cups) in a large bowl. Stir with a wooden spoon until the salt is thoroughly dissolved. Set out a 4- to 5-gallon earthenware crock. Put 2 pieces of the charcoal on a gas burner; turn on the flame, and heat until they are glowing red. (If you don’t have a gas burner, use the broiler: Put the charcoal pieces under the broiler and turn it on; remove the charcoal when it is red.) Use tongs to transfer the charcoal to the earthenware crock. Drizzle the honey over the burning charcoal. Cover the crock and wait for 5 minutes. Remove the lid. You will see lots of smoke and smell a good caramel aroma. This process sterilizes the inside of the crock and will give the sauce good flavor. Remove the charcoal and wipe the inside of the crock with paper towels. Add the bean blocks and salted water to the crock. Add the remaining piece of charcoal, the jujubes, and dried hot peppers; they will float on the surface of the water. (The charcoal will attract and absorb any dust. The jujubes add sweetness and the dried red peppers help prevent the blocks from going bad.) Cover the crock with flour sacking or cheesecloth and put on the lid. Let the blocks soak in the salty water until well fermented, 2 to 3 months. On clear days remove the lid and let the crock sit in the sunlight. Close it at night and be sure to keep the crock covered with the cloth so bugs and dust can’t get in. As time passes, the salty water will turn brown and smell like deeply fermented soy sauce.
Discard the charcoal, jujubes, and peppers. Transfer the soaked bean blocks to a large bowl. The blocks may have broken up during the soak, so use a bowl to scoop the soy sauce out of the crock and into a strainer set over another large bowl. Add any pieces of bean block to the bean block bowl. Save the soy sauce for making Korean soup soy sauce (gukganjang) later. Mix the doenjang with both hands, breaking it up into a paste, and transfer it to a 5-quart earthenware crock. Pack it down and sprinkle with the remaining ¼ cup kosher salt. Cover with the cotton cloth, secure it with a rubber band, and put on the lid. Put the doenjang crock in a sunny spot for its final fermentation. About twice a week on sunny days, remove the lid and let the sunlight shine into the crock through the cotton cloth. When it’s well fermented, the doenjang will smell sweet and taste salty and earthy, with a deep flavor. This will take 5 to 6 months. If it ever looks a little too dry on top, pour some of the separated soy sauce on top to make it moist again. You don't need to stir it in.
Store the doenjang in the crock outside the house or at room temperature. Whenever you take some out, press the rest down with a spoon to keep out the air. Once in a while, take the lid off, cover with a cotton cloth, and let the sun hit it again.