1-First step: Soak and start the brisket broth Begin by soaking 150 g beef brisket in water for 10 minutes. This short soak helps clean the meat a little before cooking. Drain it well, then place it in a pot with 4 cups water, 20 g peeled onion, 5 g green onion white part, and 10 whole black peppercorns. Bring the pot to a boil over medium-high heat. Once the broth starts bubbling, skim off any scum that rises to the top. This keeps the broth cleaner and clearer. Then lower the heat to medium-low and simmer for about 1 hour, or until the beef feels tender when sliced with a fork.

2-Second step: Strain, cool, and slice the beef When the brisket is cooked, strain the broth into a bowl or pot. Let it cool for about 30 minutes. Cooling matters here because you want a clean broth before mixing it with the dongchimi brine. Once the meat is cool enough to handle, slice it thinly against the grain. Thin slices are best because they stay tender and are easy to eat with the noodles. If you are short on time, you can make the broth a day ahead. In fact, it often tastes even better after resting in the fridge overnight.

3-Third step: Build the cold broth Measure out 2 cups dongchimi brine and combine it with the strained beef stock. Stir in 2 tablespoons white or apple cider vinegar, 1 tablespoon Korean or nashi pear juice, 1 1/2 tablespoons fine sugar, 1/2 teaspoon fine sea salt, and 1/4 teaspoon mustard powder. Mix everything well so the sugar and salt dissolve fully. At this point, taste the broth. It should feel lightly sweet, tangy, salty, and a little sharp from the mustard. If your dongchimi is already very salty or sour, start with a little less vinegar and sugar, then adjust later.

4-Fourth step: Freeze the broth until icy Pour the mixed broth into a container and freeze it for 3 to 4 hours, or until it becomes slushy and icy. You do not want it frozen solid. The goal is a very cold broth that still pours easily over the noodles. If you are planning ahead, you can also freeze the broth for up to a few months and thaw it enough to get that icy texture again when needed. For the coldest result, chill your serving bowls in the refrigerator while the broth freezes.

5-Fifth step: Cook the noodles Bring a separate pot of water to a boil and cook 200 g dried naengmyeon noodles according to the package instructions. These noodles often cook fast, so keep an eye on them. When they are done, rinse them under cold running water right away to stop the cooking and remove extra starch. If you want an even chewier bite, you can rinse them twice. Some cooks also give the noodles a quick ice bath for extra chill. Drain them well so the broth stays clear and cold instead of watered down.

6-Sixth step: Assemble the bowls Divide the noodles among serving bowls. Top each bowl with the thinly sliced beef, 40 g pickled radish or dongchimi radish, 40 g cucumber, and 50 g pear slices. Add 1 hard-boiled egg, halved, and finish with toasted sesame seeds. Then pour the icy broth over everything. Add optional mustard oil or sauce and a splash of white or apple cider vinegar if you want extra sharpness. Serve immediately while the broth is still frosty and the noodles are firm.

7-Seventh step: Serve right away Mul naengmyeon is best eaten fast, before the broth warms up. Mix the toppings lightly with the noodles, then take big slurps. That chewy, cold texture is what makes Korean Naengmyeon Cold Noodle Soup so satisfying. It is a wonderful meal for hot weather, and it also works beautifully after Korean BBQ because it cuts through rich meat with a cool, tangy finish.