Carnitas are one of the most delicious ways to serve pork shoulder, with their bright, citrusy flavor, fatty cuts of pork, and crispy edges. Sous vide is a great, hands off way to make sure they're super tender and allows you to batch and freeze plenty of servings all at once. In order to make sure the meat is as tender as possible, these sous vide carnitas get a long cook time: 12-16 hours.