Can you Peel and Cut Sweet Potatoes Ahead of Time?

You can make them not turn brown, like sliced apples.Add an acid like lemon juice to the water and it will stop them from turning brown.

I agree with the answer.A little lemon juice will keep apples from turning brown.This is a must when making a salad that will turn dark very quickly.The lemon juice will keep the salad green for a long time.

If you will only be using the fruit or veg later, you can add something acidic to the water.Salt won't go well with desert, so I would use it when adding apples to a curry.

For sweet potatoes, I would recommend using thecream of tartaric acid with water.It doesn't take much, it's cheap, and it will not change your flavor.