Re:For my final project I built a sous-vide immersion cooker
by pflanze on Tuesday December 16, 2014 @12:25AM
(#8755962)
You might be making matters worse with a jar: those with screw-on lids have a plastic lining in the lid that's traditionally PVC with plasticizers which are considered to be bad for health. To make matters worse, oil will support the migration of the plasticizers out of the plastic.
In theory you can use anything that handles the temperature, such as silicone. You could in theory force your food into a jar with a bit of oil.