I was told to blanch my green beans before vacuum sealing them. I don't know what that means or how to do it.
How to Blanch Beans
Certified GKH Gardening Expert
Blanching is quickly bringing your vegetables to boiling (without cooking it) to stop the chemical processes that will toughen the vegetable. Pop those beans in rapidly boiling water for three minutes - a fry basket is great for this - and then dump them in ice water to stop the cooking. Pat dry and Voila!