Can I Soak Potatoes in Water Overnight Before Making Mashed Potatoes?

Raw Potato Can I Soak Potatoes in Water Overnight Before Making Mashed Potatoes? Image Credit: elenaleonova/iStock/GettyImages

Whether you've grown them yourself, bought a bag at the store or mix dehydrated taters from a box, virtually every cook puts a unique spin on classic mashed potatoes. Like many culinary tricks, however, the idea of soaking potatoes in water before including them in your favorite mashed recipe remains divisive. Some swear by the soaking method, while others claim there are better ways to prep the spuds. Experimenting with your own recipe is the most reliable way to formulate an opinion on the subject, but before you start tinkering, it helps to be informed.

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In Support of Soaking Cut Potatoes

Potatoes naturally contain a starch known as amylose. If you whip up your mashed potatoes without removing some of this starch, you end up with a pasty, gummy dish. Soaking potatoes overnight in a pot of water removes some amylose, but for the trick to work, you must cut the spuds into roughly 1-inch pieces, which exposes an optimum amount of surface area. For safety, always soak the potatoes in the refrigerator and limit the soaking time to overnight, at maximum — although just a few hours does the trick.

A Quicker Method

Soaking potatoes in water is only one way to rid the spuds of a little sticky amylose. For an arguably quicker method, wash sliced potatoes after parboiling or steaming them, but before you mash them, by running them under cool water for a few seconds. This washing doesn't replace thoroughly scrubbing the potato skins, as it — like soaking overnight — targets the starchy insides of the spuds.

For extra insurance, following both methods doesn't hurt. Try soaking the potatoes overnight, then rinsing, slicing and parboiling the tots. Pour into a colander and rinse them under cool running water for a few seconds before returning them to the pot with fresh water or milk and cooking them completely.

A Taste for Nutrition

Apart from the effects soaking and rinsing have on the texture of mashed potatoes, these methods can affect nutritional content. Soaking cut potatoes can sap their nutrients. To retain these nutrients and up the flavor of your mash, parboil the potatoes in stock rather than soaking them. For a more subtly sweet flavor, parboil the potatoes in milk. Regardless of your prep methods, leave the skin on while boiling or parboiling to retain as many nutrients as possible. If you go with one of these methods, remember to rinse the sliced potatoes under cool water to remove excess starch.

More Tater Tricks

For even smoother, creamier potatoes, simmer the slices in a mixture of milk and cream after parboiling and rinsing them. Different diners prefer various textures and consistencies, so experiment with a combination of smoothing methods — including soaking, rinsing and simmering — until you find the tater tricks that work for you. Do not soak potatoes before frying them; the starch you want to remove for mashed potatoes actually helps fried dishes reach their maximum crispiness.

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