Toss the short ribs with the mushrooms, ginger, star anise, peppercorns, three entire scallions, cilantro stems, and beef stock in a large saucepan or Dutch oven.
After bringing to a boil, simmer, covered, over low heat for about two hours, or until the meat is cooked.
Prepare your toppings and set them aside while it cooks.
Sort the leftover liquid and toss in the additional ingredients after dividing the short ribs and mushrooms into five soup dishes.
Heat the soup to a boil over high heat. Add the Swiss chard stems and simmer for 3 minutes. Next, add the leaves and cook for 2 to 3 minutes, or until brilliant green.
Pour 1 3/4 cups of the soup into each soup dish.
Add lime wedges, scallions, ginger sticks, cilantro leaves, and crushed red pepper flakes as garnish.