According to the Centers for Disease Control and Prevention, at a minimum, potatoes should be rinsed with water before cutting for cooking. Since potatoes are firm, use a clean brush to scrub them. Do not use soap, bleach, disinfectants, or chemicals to clean produce.
Rinsing potatoes helps remove excess starch, so it is recommended to rinse the potatoes before cooking. To ensure even more starch is out of the way, it's recommended that they even be quickly rinsed after boiling.
White vinegar diluted with water can help disinfect potatoes, but simple water and scrubbing is just as effective. If the potatoes are very dirty, consider soaking them in a clean sink filled with water first. When peeling the potato, be sure to cut away any sprouts or discolorations.
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.
Rinse and scrub the potatoes under cold water. Using a sharp knife, cut potatoes into thin 1/4 inch strips. Transfer the potato strips to a large bowl, cover with vinegar, and let the potatoes soak for about 30 minutes. Drain the vinegar and pat the potatoes dry.
Washing is vital since potatoes are root vegetables grown in the ground, and their skins can carry dirt, pesticides, and bacteria. Furthermore, the Centers for Disease Control recommends that you wash all produce, even those you can peel, like potatoes.
Rinsing potatoes with cold water prior to boiling helps remove excess starch. Rinsing with hot water immediately after boiling can remove even more starch.
Boiling in hot water is just going to push around any dirt particles or sand. As far as scrubbing, just check a couple of the potatoes as a sample and if the eyes are deep they can easily trap excess dirt. If shallow you probably can get away from doing this step.
Don't scrub your potatoes with a kitchen sponge. They're dirty and full of germs. Who can find a vegetable brush in this messy junk drawer?
The US Food and Drug Administration, the US Department of Agriculture and other scientists agree: use a cold water soak with baking soda to effectively help remove dirt, chemical residue, and other unwanted materials from your fresh vegetables and fruits.
Soak potatoes in cold water to loosen the dirt. A 15- to 30-minute soak should do the trick. Lift the potatoes out of the water, and scrub them with a vegetable brush under cold running water to remove the dirt. If peeling, proceed by removing the potato skins with a vegetable peeler.
While you can certainly use a dedicated potato or vegetable scrubbing brush for this step, a clean dish towel, paper towels, or even an exfoliating bath and shower glove will do the trick to remove the last bits of dirt.
You should definitely clean potatoes even if you plan to peel them. Why? Dirt and contaminants. Potatoes are on the Environmental Working Group's Dirty Dozen list of produce most contaminated with pesticides, meaning it's advised you buy organic, if possible.
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.
After scrubbing and dicing potatoes, rinse under cold water. Soak diced potatoes in a bowl of cold water for at least 1 hour.
2. 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.
Prior to cooking potatoes, one way to reduce acrylamide formation is soaking them in water. According to the FDA, soaking potatoes in water for 15 to 30 minutes is sufficient to reduce the levels of acrylamide during cooking.
Instructions: Place potatoes into a pot and add 1 1/2 cups vinegar with 3 cups cold water (or enough to just about cover the potatoes).
Combine potatoes, 1 cup vinegar, and 1 Tbsp. kosher salt in a medium saucepan; add water to cover by 1”. Bring to a boil, reduce heat, and simmer until potatoes are tender, 20–25 minutes; drain and pat dry.
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.
If you're prepping with smaller pieces, don't soak for more than 12 hours. This trick is handy, but it'll only work for about 24 hours — so don't prep too far in advance. After too long they'll start to take on water and may lose their structure when you go to cook them.
For most potato dishes it's important to add the potatoes to cold water and allow the water to come to a boil with the potatoes in the water. The potato starch can react as soon as it comes in contact with hot water, which will promote uneven cooking and mealy potatoes.