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.
Adding salt would raise the boiling point of the water, and delay the bubbling visual signal we associate with boiling water. This would cause the cook to unnecessarily continue heating the water past the point when it would be hot enough to cook the potatoes.
Well, the salt raises the boiling temperature of the water, resulting in a super-creamy inside and a wonderfully flavourful, salt-crusted outside. And no, they are not super-salty potatoes, as they are boiled whole, the salt doesn't reach the inside of the 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.
Cooking your potatoes in very generously salted water—about a tablespoon of water per pound of potatoes—means the potatoes will be seasoned all the way through. Once mashed, they'll need a lot less salt on the back end.
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.
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.
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.
But the most essential suggestion, per Bon Appétit, is always to salt the water you are boiling your mashed potatoes in. It acts as pre-seasoning, and Bon Appétit recommends adding a full cup of kosher salt to the boiling water.
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.
Just give them a good rinse to remove any dirt and cut out any blemishes you see. Some people may prefer to peel the potatoes before boiling, but we would recommend you leave the skins on. This ensures that the nutrients and flavours are not lost during cooking and you get all those lovely vitamins too.
Season with a teaspoon of salt per pound of potatoes. Bring water to a boil over high heat, then reduce heat to medium and cook at rapid simmer until potatoes are easily pierced with a paring knife, about 10 minutes for chopped potatoes and 20 minutes for whole potatoes.
Step 3: Add potatoes to the saltwater so they are completely submerged. Soak for a minimum of 2 hours. This is the secret step … the brining process must not be skipped. This is what gives you a fluffy delicious baked potato that really is the best you've ever tasted.
If the salt concentration in the cup is higher than inside the potato cells, water moves out of the potato into the cup. This leads to shrinkage of the potato cells, which explains why the potato strips get smaller in length and diameter.
Boil 10 to 12 minutes for cubed, 15 to 20 for whole medium-sized, or 25 to 30 for whole russets. Check with a fork or knife. Potatoes are done when they are tender enough that a utensil easily slides into the middle.
Turn the burner on high and bring water to boiling. Reduce the heat to medium-low or low. Cover the pot with a lid. Cook the potatoes in gently boiling water until tender, about 15 minutes for small red potatoes, new potatoes or cubed large russet potatoes, and 20 to 25 minutes for quartered potatoes.
They can sit for an hour, or two, like this, Foster says. When you are ready to continue, set the pot over low heat and the simmering water will heat the potatoes back up so you can mash them.
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 baking soda makes the water alkaline, which helps to break down the surface of the potatoes, apparently. O. M. G. So good. Trust me, these extra crispy roasted potatoes are seriously good.
Bring to a boil, reduce heat to medium, and cook uncovered until potatoes are tender and can easily be pierced by a knife, about 10 to 15 minutes (20 to 25 minutes for larger potatoes). Drain well, tossing in colander to remove excess water.
The best reason to add salt to water is to improve the flavor of food cooked in it. Salting water also helps it boil (slightly) faster. While salting water does increase the temperature at which it boils, the effect is so small that it really has no impact on cooking time.
MYTH: Salted water boils faster. TRUTH: Adding salt raises the boiling point of water (slightly), so it does make your water hotter, but it's not going to boil any faster. The amount of salt added is much too low to make a noticeable difference in your cooking time.
Adding salt to water does two things, it increases the boiling point and decreases the specific heat capacity.