Dak Gomtang (Korean Chicken Soup)

Name: Dak Gomtang (Korean Chicken Soup)
Prep time: 10 min
Cook time: 50 min
Total time: 1 h
Cuisine: Asian, Korean
Ingredients: 1 whole chicken (3 to 4 pounds); 10 - 12 plump garlic cloves; 1 1-inch piece ginger, sliced; 1/2 medium onion; 2 - 3 scallion white parts; 1/2 teaspoon whole black peppercorns (if available); 3 scallions, finely chopped to garnish; salt and pepper to taste; 3 tablespoons gochugaru; 2 teaspoons minced garlic; 1 tablespoon soup soy sauce (guk ganjang, 국간장) (use regular soy sauce if unavailable); 3 tablespoons chicken broth from the soup