This is a great make-ahead dish. You can refrigerate the cooked short ribs for up to 4 days or freeze them for up to 3 months. After the stew has been refrigerated or frozen, the fat on top will solidify, making it easy to remove if desired. You can reheat the stew in an Instant Pot—simply dump the ribs and sauce back into the Instant Pot and cook under high pressure for 5 minutes. Keep the short ribs warm until you’re ready to serve.