To braise the oxtail at home, simply add 3 pounds oxtails to about 16 ounces water to submerge in a large stovetop pressure cooker. Carefully lock on the lid and cook over medium-high heat until pressure is reached, then cook at high pressure for about 45 minutes. Allow to release the pressure naturally for 20 minutes before fully releasing the pressure. Carefully open the lid and allow to cool to the touch before separating the bones from the meat.