This recipe is great in an instant pot. If you opt for that route of cooking, cut the chuck roast in half. Place into the Instant Pot and cook for 1 hour and 10 minutes with ½ cup orange juice, 1 cup broth and the quartered onions. Once the timer is up, let the Instant Pot do a natural release of pressure, then remove and transfer the meat to a sheet pan. Tear the meat into pieces, it should shred incredibly easily, then transfer under a broil to caramelize.