This was the most tender & juicy slice of tenderloin I have ever had. Sous Vide is a method of cooking foods to perfection in a temperature controlled water bath. This application is being used in restaurants all over the world. Most meats can be cooked ahead of time SV style and left to rest in the water bath or cooled & refrigerated until ready to serve. You will need a chamber type vacuum sealer system (ie. FoodSaver) and a Sous Vide Thermal Circulator. With this method, it is important to note that when using herbs, foods will absorb herbs to a greater degree. Philip uses 1/3 less herbs and spices but 100% of salt. *Please note: we cooked at 138° for medium-rare. Source: Philip Preston, president and Owner of PolyScience.