Skip to Content

Is a Plastic Knife a Substitute for Vacuum-Packing Cut Lettuce?

As an Amazon Associate, I earn from qualifying purchases.

Is a Plastic Knife a Substitute for Vacuum-Packing Lettuce? You might be surprised. Read my answer to this question I received from one of my readers.

Is a Plastic Knife a Substitute for Vacuum-Packing Lettuce

It’s question time again, folks!

In regard to the way I vacuum-pack lettuce into Mason jars, several people have left comments/questions about the use of a plastic knife to cut lettuce. They claim it deters brown cut edges, thus avoiding the need to vacuum-pack lettuce for those who desire to store cut lettuce long term.  

When I say long-term, I’m talking at least a week to 10 days.

How I determined the answer

I decided to test it for myself, so I chopped some hearts of Romaine with a plastic knife and some with a metal knife.

I prepared three jars.  

The first jar contained lettuce cut with a plastic knife, stored in a securely-covered glass jar, but not vacuum-packed.

The second jar contained lettuce sliced with a plastic knife, then vacuum-packed.

I prepared the third jar the usual way I always do it–with hearts of Romaine lettuce, swiftly chopped with a metal knife and then vacuum-packed.

Is a Plastic Knife a Substitute for Vacuum-Packing Lettuce? -- lettuce in the refrigerator

I stored these prepared jars in the refrigerator Sunday afternoon.

Is a Plastic Knife a Substitute for Vacuum-Packing Lettuce? --jars of lettuce in the test

The following Friday, I opened them to see the results.

plastic knife and lettuce results
Which lettuce would you pick?

Interesting, don’t you think?  The two jars that were vacuum-packed, both the one cut with a metal knife and one cut with a plastic knife, still look as fresh as the day I packed them. No brown edges. But that jar on the left, cut with a plastic knife, but not vacuum-packed?  Yuk!!

The answer to the question:  “Is a Plastic Knife a Substitute for Vacuum-Packing Lettuce?”

Looks like I won’t be needing my plastic knife after all since a sharp metal knife cuts faster and easier.  Indeed, vacuum-packing removes the oxygen so the edges don’t get brown no matter how you cut the lettuce.

Potato-Cheese Yeast Rolls
Cheesy Potato Rolls: A Bread Machine Recipe To Make the Night Before
← Read Last Post
Strawberry Snowball Cake
Snowball Cake with Strawberries: A Makeover for Angel Cake Fail
Read Next Post →