Short Rib Soup

Name: Short Rib Soup
Prep time: 15 min
Cook time: 1 h 20 min
Total time: 1 h 35 min
Cuisine: Asian
Ingredients: 5 short ribs (about 4 oz each with bone, or 3 ounces each without, trimmed of excess fat); 8 ounces shiitake mushrooms (stems removed and sliced); 1 1/2 inches ginger (peeled, sliced into disks, and smashed); 5 scallions (3 whole, 1 chopped for garnish); 1/2 bunch cilantro (stems separated and leaves chopped); 8 cups beef broth; 1 teaspoon whole black peppercorns; 3 whole star anise; 1 lb Swiss chard (stems and leaves separated and coarsely chopped); lime wedges; crushed red pepper flakes or sriracha; fresh ginger cut into thin matchsticks