Add the beef into a big pot (or an Instant pot or a pressure cooker). Add 4 cups of cold tap water to cover the beef. Add the green onions, ginger, and Sichuan peppercorns. Cook over medium-high heat until it reaches a boil. Stir occasionally to prevent from sticking. Turn to medium heat. Boil for 10 minutes while skimming the brown foam off the top and discarding the foam.