Good Luck Beef And Korean Rice Cake Soup

["Cut meat into 1 1/2"" pieces. Heat sesame oil and 1 Tbsp. vegetable oil in a large pot over medium-high. Add meat and season with salt. Cook, turning occasionally, until browned on all sides, 8-12 minutes.", "Meanwhile, separate scallion whites from greens and coarsely chop; set aside. Thinly slice scallion greens and set aside separately for serving.", "Using a flat-bottomed mug or the side of a chef's knife, lightly smash ginger. Add to pot along with garlic, reserved scallion whites, and 16 cups cold water and bring to a boil. Reduce heat and simmer, skimming any foam from surface, until meat is tender, 60-75 minutes, if using stew meat, or up to 2 hours , if using brisket. Transfer meat to a plate with a slotted spoon, then scoop out ginger and scallion whites and discard.", "Add Korean radish to pot and simmer until tender but not mushy (it should still hold its shape), 12-15 minutes.", "Meanwhile, heat 1 tsp. vegetable oil in a medium nonstick skillet over medium. Whisk eggs in a medium bowl and season with a large pinch of salt. Pour half of eggs into the center of skillet and quickly swirl pan to distribute evenly. Cook eggs undisturbed until they are just set, about 2 minutes. Carefully loosen with a heatproof rubber spatula, flip, and cook until other side is just set, about 1 minute. Slide egg crepe onto a cutting board and fold in half; let cool. Slice into 1/4""-thick ribbons. Repeat with remaining eggs and 1 tsp. vegetable oil.", "Slice beef as thin as you can and return to pot; add rice cakes. Cook until rice cakes are soft, about 5 minutes. Stir in fish sauce; taste and season soup with more salt and a few grinds of pepper.", "Ladle soup into bowls and top with sliced egg, reserved scallion greens, and chile threads (if using).", "Soup (without garnishes) can be made 2 days ahead. Let cool; cover and chill. Reheat over medium before serving."]