1 (6-inch) piece nori, sliced into strips, for serving
Directions
To make the soup broth, add the beef, 4 whole scallions, the ginger, 4 peeled garlic cloves, and the salt to a large pot.
Cover with 10 cups of water.
Bring to a boil for 10 minutes, skimming the fat from the top. Lower the heat and simmer for 1 hour, or until the beef is cooked through.
Once the beef is tender, remove it from the pot and slice thinly.
Remove the solids from the pot, leaving the broth simmering.
Add 1 tablespoon Korean soup soy sauce to the broth and stir to combine. Bring to a boil.
Add the rice cakes and stir to avoid sticking. Boil until tender, about 2 to 3 minutes.
In the meantime, season the sliced beef: In a bowl, toss the beef with the remaining 1 tablespoon soy sauce, the sugar, sesame oil, 2 finely chopped scallion whites, and 2 cloves minced garlic.
Heat 1 tablespoon neutral oil in a wok or cast iron skillet over medium heat.
Add the beef and sear, tossing, until browned, about 5 minutes.
To make the egg garnish, first whisk the egg in a bowl until very smooth.
Heat 1 teaspoon neutral oil in a small, nonstick skillet over medium heat.
When just warm, add the egg and gently cook until set, about 1 minute. If any raw egg remains, tilt the pan until cooked.
Flip the egg onto a plate and fold into a log.
Slice into thin strips. Set aside.
To serve, ladle the soup into bowls and top with the seared beef, sesame seeds, nori strips, and sliced egg.