Tteokguk (Korean Rice Cake Soup)

Name: Tteokguk (Korean Rice Cake Soup)
Cook time: 1 h 40 min
Total time: 1 h 40 min
Ingredients: 1/2 pound beef chuck, loin, rib eye (preferably tender cut); 2 tablespoons soup soy sauce (guk ganjang, 국간장) (see note 1); 1 tablespoon minced garlic; Salt and pepper; 1/2 pound beef brisket, flank steak, or shank meat; 1/2 medium onion; 3 scallions – white parts (or 1 Korean daepa white part); 5 – 6 plump garlic cloves; 2 tablespoons soup soy sauce (guk ganjang); 4 cups sliced garae tteok (가래떡, rice cake); 1 or 2 scallions; 1 egg (optional ); 1/2 sheet gim (김, aka nori), roasted (cut 1.5-inch strips with kitchen shears, or simply crush them with hands.)