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.
Always start potatoes in cold water.
Dropping them into boiling water is a bad idea because the hot water will cook the outsides of the potatoes faster than the insides, leaving you with unevenly cooked taters. By the time they've fully cooked to the core, the outsides will be mushy and start to flake apart.
Avoid getting specks of dirt in your spuds by thoroughly rinsing in cold water and scrubbing them first. If you throw cubed potatoes into a boiling pot of water, the outside will overcook and the inside won't cook enough.
Do You Need to Wash Potatoes? In short, yes, it's very important to wash potatoes before cooking with them. Potatoes are on the list of the most pesticide-ridden produce, otherwise known as the “Dirty Dozen,” so it's especially crucial to get rid of any harmful residue.
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 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. We recommend using hot water for rinsing after boiling and cold water prior to boiling.
The boiling point
The most important part here is that you use cold water instead of boiled – if you boil the water first, the outside will cook faster than the inside resulting in an uneven texture. Cubed spuds will take around 15 minutes where larger chunks or whole new potatoes will be 20-25 minutes.
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.
Potato advises ditching the fancy produce washes, soaps, and vinegars, and to simply rinse them with water instead. If you need to clean several pounds of potatoes at one time, let your clean kitchen sink become a soaking tub for the potatoes, and fill it with water until the potatoes are submerged.
Whether grown in a garden, a barrel, old tires, or a grow bag, potatoes need to be covered with loose organic material periodically, or hilled up.
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.
Clean potatoes before storing them. You need only brush off the soil on potatoes grown in coarse, sandy soil. But if the soil is fine, sticky clay, your potatoes may need washing. If so, be sure they are completely dry before placing them in storage.
You Don't Season the Water
As with pasta water, there's a reason to liberally salt the water in which the potatoes will cook: As the starches in potatoes warm up, they open up and absorb water (and salt if you season the water). When they're finished cooking, the cells close off.
The baking soda bath breaks down the potato's pectin and draws the starch to the surface, which promotes browning and the satisfying crispiness that only a perfectly roasted potato can deliver.
Larger pieces (about 2 inches across) may need longer, around 15 minutes. Medium whole potatoes should boil 20 minutes before they'll be tender. Even larger potatoes, such as those that are baking potato size, may need 25 to 30 minutes.
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.
Bring the water to a boil. Reduce heat to medium low. Cover the pot with a lid and let simmer until fork-tender, about 10-15 minutes for small and/or cubed potatoes or 20-25 minutes for large potatoes. Drain and cool.
Fields White recommends soaking the potatoes in cold water first before cleaning them, to break up the dirt. "This is like soaking a dish that has dried food on it—it just loosens things up so you don't have to scrub," she says.
Here's how this sticky state of affairs happens: Cooking causes the starch granules within the potato cells to absorb water and swell. Some cells will inevitably burst, releasing tacky gel that helps give mashed potatoes their cohesiveness.
Boiling does kill any bacteria active at the time, including E. coli and salmonella. But a number of survivalist species of bacteria are able to form inactive seedlike spores. These dormant spores are commonly found in farmland soils, in dust, on animals and field-grown vegetables and grains.
The Food and Drug Administration advises you wash potatoes before you eat them. Potatoes grow in the ground, and carry not only dirt but also bacteria to the grocery store and later, your table. Pesticides also remain on potato skin; even organic potatoes carry some degree of contaminants.
Whether you're preparing loaded baked potatoes, a hash-brown casserole or plain ole' mashed potatoes, keep the peels out of the garbage disposal! The starch from potatoes and potato peels can turn into a “thick paste,” which may cause the blades to stick.
Since potatoes grow in dirt, they do need to be washed at some point when harvested out in the fields. We try to keep the dirt on till the potatoes come out of storage, as washing them immediately might trap moisture in the eyes of the potatoes and create a musty or mold smell while stored.
Storing potatoes in the fridge will cause the starch to turn to sugar, giving them a sweet flavor that you don't want from your potatoes.