It's a vacuum seal plastic bag and you let the pid controller keep the bath at a temperature a few degrees warmer than you want the steak to finish at. Take the

It's a vacuum seal plastic bag and you let the pid controller keep the bath at a temperature a few degrees warmer than you want the steak to finish at. Take them out of the bag and sear them really quickly and you have perfect steaks. Here is a great guide if you want to look further: http://amath.colorado.edu/~baldwind/sous-vide.html http://amath.colorado.edu/~baldwind/sous-vide.html