How to Keep Potatoes From Turning Brown
To keep cut potatoes from turning brown simply run a good amount of cold water into a pan and then sprinkle salt into the water. Add cleaned and cut potato pieces, trying to keep the pieces similar in size. The water should be at least an inch higher than the potatoes when ready to store. For this sized pan, about 4 medium potatoes, sprinkle about 1/4 teaspoon of salt into the water. Use more salt, and more water, if you’re using more potatoes.
Pictured are cut Russet potatoes sitting in salt water right after they’ve been cut. We then placed the pan directly into the refrigerator for storage.
Here’s the same pan, removed from the refrigerator a whopping four days later. As you can see, the potatoes are still white and ready to go.
So, how long can you keep cut potatoes from turning brown? We actually proceeded to boil these potatoes and made delicious mashed potatoes on the fifth day after cutting. We don’t recommend keeping cut potatoes around beyond that, as they will begin to turn color and should be cooked within that amount of time.