Mix burger with Worcestershire Sauce.
Press half the meat into one side and then the other putting a piece of cheese into the middle and pressing it so the two halves connect*.
Set the sous vide in a large pot of water or sous vide container and set to 2 hours at 135 degrees.
Add two burgers to a medium sized food saver bag and slowly remove the air. Repeat for the other burgers.
Add the burgers to the sous vide pot making sure the burgers are completley submerged.
After the burgers have cooked, remove from the food saver bags and pat dry.
To finish the burgers you can either cook them on a medium/high heat grill for 3 minutes each side. OR you can cook them in a cast-iron pan for 3 minutes each side.
Test the center to make sure that the burger is at least 160 degrees in the center.