If you do – just soak them for 5 minutes and rinse. Doing so is a science thing – soaking cut potatoes removes excess potato starch. This means fluffy mashed potatoes (and not gluey!)
Give them a cold water bath: Once your potatoes are chopped, toss them into a large bowl. Then cover the potatoes completely with cold water and let them soak for at least 30 minutes (or up to overnight). This will help to rinse off the excess starch and help the potatoes crisp up beautifully in the oven.
If keeping potatoes in water for more than an hour, refrigerate. However, don't soak them any longer than overnight—after that, the potatoes start to lose their structure and flavor.
We usually recommend no more than 24 hours. You can keep the potatoes from absorbing the water by making sure the water is not salted, and is chilled (you can even add ice to the water). To keep the potatoes from turning black from oxidation, add 1 teaspoon of lemon juice or white wine vinegar to a gallon of water.
Soak raw potatoes in a container for up to four hours. The potatoes should be fully submerged to prevent oxidation and discoloration. After four hours, the potatoes should be rinsed with cold water. Chopping, cutting or otherwise slicing the potatoes will excrete more starch.
Running the potatoes through a food processor is the best way to release all the starch the potato has to give. Using an electric mixer to whip the potatoes releases some starch, but not too much. Last, but equally important, is the soaking and rinsing process.
One of the starch molecules in potatoes is called amylose, which is responsible for making mashed potatoes "gluey" and pasty. Rinsing or soaking cut raw potatoes helps to wash away a very small amount of amylose.
— you may have wondered if you can shave off some party-day stress by making them ahead of time. We've got good news: You can prep the potatoes themselves a few days beforehand — and actually mash them up to 1 day before.
Soaking peeled, washed, and cut fries in cold water overnight removes excess potato starch, which prevents fries from sticking together and helps achieve maximum crispness.
Leaching method: Peel and dice potatoes. Place in a large pot of warm tap water and soak for 2 to 4 hours. Drain and set aside.
Make 'em in advance… or throw the diced potatoes in cold water until you're ready to cook them. They can sit in the water for up to 24 hours before cooking. Throw 'em in the fridge, and let them soak overnight if that works better for you.
Doing so is a science thing – soaking cut potatoes removes excess potato starch. This means fluffy mashed potatoes (and not gluey!)
Soaking potatoes in water helps remove excess starch. Excess starch can inhibit the potatoes from cooking evenly as well as creating a gummy or sticky texture on the outside of your potatoes. Cold water is used because hot water would react with the starch activating it, making it harder to separate from the potatoes.
Why use salt water for soaking potatoes? There's moisture naturally found in potatoes, and moisture is drawn to higher concentrations of salt. (This is a process called osmosis.) So, if you put the potatoes in a salt water bath, that will help draw out some of their moisture, resulting in crispier fries.
You will only get crispiness if enough water has left that outer part of your fry.
Boiling the potatoes in a salt and vinegar bath allows them to soak up all of that briny flavor before you dry them off and crisp them up in the oven. The result is a soft-in-the-center, crispy-on-the-outside potato that's loaded with flavor.
SOAK your potato chunks in cold water.
This removes some of the starch and helps get them super duper crispy.
Vinegar causes the potatoes to form a thin crust that further helps in retaining their shape. Vinegar increases the acid pH levels of water which further helps the potato just like when you add a little salt to the water while boiling eggs.
Fill a bowl with cool water, submerge the potatoes, then cover with plastic wrap. Store in the refrigerator overnight. When it's time to start working with the potatoes, drain them well in a colander and get cooking.
You can store peeled potatoes in water in the refrigerator for about 24 hours. Peeled potatoes left out by themselves at room temperature, on a refrigerator shelf or wrapped in foil or plastic wrap will still get dark overnight, so submerge them in a bowl of water, cover and refrigerate.
It Draws Out Water
Potato cells contain more salt and less water. That's why soaking potatoes in a bowl of salt water helps balance their concentrations. This process is called osmosis, where the moisture is drawn out of the potato cells by higher salt concentration.
The Mistake: Overworking the Potatoes with a Food Processor, Blender or Mixer. Too much — or too vigorous — mashing will produce gluey potatoes. Your best tool is an old-fashioned masher, fork, ricer or food mill.
When potatoes are mashed, starch is released. The more you work the potatoes, the more starch gets released. When too much starch gets released, the potatoes become gummy, gluey, and unappetizing.