How can I store peeled potatoes without them turning dark?
Once you have peeled each potato add it to a chilled water solution that has either concentrated lemon juice or white vinegar. It only takes a tablespoon of the acidic lemon juice or vinegar per half gallon of water and this helps slow down the oxidation. Also, fill up the container so there is not much air left and seal it before placing back in the refrigerator.
