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In a large pot, bring the meat, onion, scallions, garlic, ginger and peppercorns to a boil, uncovered, in 14 cups of water. Reduce the heat to medium to keep it at medium boil, and skim off the scum. Continue to boil, covered, until the meat is tender. Stir in soup soy sauce. Remove the meat and cool. Discard the vegetables. Cool the broth.
Bibim Naengmyeon Mix all sauce ingredients and keep it cool in the fridge. You can do this ahead of time. – See mul naengmyeon above for cooking noodles and preparing the toppings. For bibim naengmyeon, slice or julienne the cucumber and do not salt.
Place the noodles in the middle of the serving bowl, and drizzle 1 teaspoon of sesame oil over the noodles. Top with the pickled radish, cucumber slices, pear slices, sliced beef, and the egg half. Drop in a few ice cubes. You can add 1/4 cup of beef broth, if available, to the bottom of the bowl. The sauce can be served on top or separately. Serve with vinegar and hot mustard on the side.