As someone with Cerebral Palsy I run into this situation a lot.
Step. 1
Fill a pot a pot with about an inch of water.
Step. 2
Bring water to a boil and remove from heat.
Step. 3
Place the jar upside down, lid first into the water for 30 seconds.
Step. 4
Quickly flip the Jar, with a towel twist the lid and presto, you can eat today.
