Originally Posted by jobro
What is a water bath and how do you keep the temperature constant?
A water bath is a water oven, basically an appliance that is a container of water that can be kept at a constant temperature. Restaurants use an immersion circulator, which is a tub with a heating element and a device that circulates the water to keep the temperature constant across the vessel. Last year a device came on the market for home cooks, the Sous Vide Surpreme. I have one of these. You vacuum seal the protein, in this case chicken, in a food grade plastic bag, set the temperature of the water, then use a rack in the oven to keep the chicken submerged for however long you want to cook it. It's a really versatile way to cook lots of things with results that can be dramatically different than direct heat methods.