Naengmyeon is a popular Korean spicy cold noodles made with buckwheat flour, served chilled. Paired with bibim naengmyeon sauce, these chewy noodles are a beloved summer favorite in Korea.
In a zip-top bag, whisk together water, carbonated drink, beef bouillon powder, and mustard. Seal the bag tightly and lay it flat in the freezer for 1-2 hours until it becomes partially frozen.
To make naengmyeon sauce
In a small pot, combine soy sauce and water. Bring it to a full boil over high heat, then remove from the heat and let it cool.
In a blender, combine onion, garlic, apple, pineapple, and 3 tablespoons of water. Puree until smooth.
Transfer the puree into a mixing bowl. Add the soy sauce mixture, Korean chili flakes, brown sugar, Korean corn syrup or honey, ginger paste, mustard, sesame oil, and sesame seeds. Mix well. Let the sauce chill in the refrigerator for at least 20 minutes or overnight.
To make radish pickles
Combine thinly sliced radish with salt, sugar, and vinegar in a mixing bowl. Let it sit for 20 minutes. Rinse the radish slices once and firmly squeeze out excess moisture. Set aside.
To cook noodles
Bring a pot of water to a boil. Add the noodles and stir. When the water returns to a boil, add a shot of cold water. Repeat this process until the noodles are soft and chewy according to the package directions. Drain the noodles in a colander and rinse them under running cold water. Drain again.
To assemble bibim naengmyeon
If using naengmyeon broth, crush the partially frozen broth with a meat hammer. Add 1/2 cup of the icy broth to the bottom of the serving bowl.
Place the cooked noodles in the bowl and add about 6-8 tablespoons of the bibim naengmyeon sauce on top. Garnish the dish with pickled radish, cucumber, Korean pear (if desired), and a hard or soft-boiled egg. Sprinkle toasted sesame seeds over the dish according to your preference. Enjoy your homemade bibim naengmyeon!