A sous-vide is an "under vacuum," a method of cooking food sealed in plastic bags and then dipped into a water bath that typically takes up to 72 hours to complete. Why cook your food in plastic baggies, you ask? To make sure all the ingredients come out pure and unadulterated.
If you have a slow cooker in your home then you can cook food the sous-vide way.
Jeff Potter, author of Cooking for Geeks, shares a very technical tip on how to turn your slow cooker into a sous-vide machine.