"Yes, it's good to prick them," Smith told Food52. "It pokes holes in the skin, which allows steam to escape. Otherwise, they could explode—it doesn't happen all the time, but it happens every once in a while.
Poke the potatoes with a fork just enough to pierce the skin so the potato won't burst when baking, especially in the microwave. Four or five times should be plenty. A potato is composed mainly of water, so poking them helps release steam as it cooks.
Potatoes can form rupture tears from steam buildup inside, if holes are not poked into them. This doesn't really hurt them, but the tears can be pretty unsightly when served. So folks just poke holes in them to let the steam out while they're cooking.
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.
We actually don't do anything special to keep the potatoes from exploding in the oven. Some people prefer to poke holes in their potatoes (which is said to let the steam out of the potatoes, preventing explosion), but because we've never ever experienced a potato explosion, we skip that step.
“Cooking potatoes in unseasoned water prevents the starch from cooking thoroughly and creates a bland dense finished product. I would say not salting the water is like gifting a pair of shoes without laces.
Potatoes soak up a lot of flavor, so salting the water prior to cooking is a good idea for the best taste. And you aren't limited to plain salted water for boiling your potatoes, either.
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.
Always prick your spud! The old adage of them exploding under the pressure of oven heat is actually true. As the potato cooks, the skin acts as a seal, trapping water that expands the spud and steams during cooking.
The experts at the Idaho Potato Commission — people who know their potatoes — recommend boiling potatoes with the skin on. This keeps the nutrients inside the potato during the cooking process and adds a bit of flavor and texture to the finished product as well.
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.
Set over high heat. Once the water reaches a boil, reduce heat to low heat, cover, and maintain a gentle simmer. Cook the potatoes until they are fork-tender and the skin just starts splitting from the potatoes – remember, the total time will vary depending on the size of your potatoes.
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.
Whole, unpeeled new potatoes take about 45 minutes to cook, including the time it takes to bring the water to a boil and then finish cooking at a simmer.
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.
How long can peeled and cut potatoes sit in water before cooking, before they begin taking on too much water? A: 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).
Yes, you can over boil them and they could get mushy and lose some nutrients. Boil them until they are near the end of their firmness. This methods works well for buttered, mashed, or diced potatoes, or when used in salad. I think there are better ways to cook potatoes, like baking, roasting, and for use with toppings.
"Baking soda [what Americans call bicarbonate of soda] breaks down the pectin in the potato and draws starch to the surface. What do you get? Wonderful browning and a crispiness you wouldn't otherwise achieve.”
Ideally, you should wait until your water is at a rolling boil. The boiling water will agitate and dissolve the salt quickly. You can add salt to your cold water if your prefer, though. You don't want to forget it after all!
Potatoes can be can be boiled, roasted or steamed until tender, then mashed, puréed or simply just served as they are.
Why is it common to salt the exterior of a baked potato? A: Chefs started doing this years ago to allow the salt to absorb or draw out the moisture of the potato while baking, which results in a dry, fluffy potato. They used to do something similar with prime rib, sometimes baking it over rock salt.
Adding oil to potatoes before baking is perfectly fine, just a personal preference. Without oil the Idaho russet skin bakes up crispy, with oil the skin will carry a lot of the flavor of the oil so some people have a preference for using olive oil or peanut oil.