The addition of a mildly acidic vinegar to a starchy veggie like potatoes not only deepens the flavor profile, but it also helps to tenderize the tubers.
Vinegar causes potatoes to develop a thin crust on their exterior layer, which is what is required to preserve them from becoming mushy or disintegrating.
While no one likes mashed potatoes that are dry and chalky, you'll want to use a flavorful liquid to add moisture, like milk, cream or even chicken stock. If you'd like, gently reheat the drained potatoes on the stovetop to dry them out slightly before mashing with your preferred seasonings.
"Vinegar is an inherently acidic material, so if we add a few drops of vinegar into that boiling water that is going to increase the rate of denaturing and it's going to make that happen faster and help the poached egg hold its shape better."
When too much starch gets released, the potatoes become gummy, gluey, and unappetizing. Overworking the potatoes can happen in a couple ways: either by simply handling them too much, or by using a food processor, blender, or similar tool, which mixes the potatoes too aggressively.
Too much starch is what makes mashed potato gluey and ruins its fluffy texture. If you want to keep your mashed potatoes from getting gummy the best way to do this is using a potato ricer. Otherwise, you can still make classic fluffy mashed potatoes without a ricer by using a Food Mill instead.
A little vinegar goes a long way
Once you've determined that you're using the correct type of potato for boiling, adding vinegar to your pot of water will help them retain their shape.
Hemicellulose, the carbohydrate that makes up potatoes, softens when cooked, but when you add an acid like vinegar, the hemicellulose will remain solid instead. Even when the acidic element is diluted in the boiling water, the potato won't fully soften, McGee explained to the outlet.
Baking soda!
Vinegar allows you to boil the potatoes the longest and keep them firm but I didn't get the soft outer surface I wanted. (I did get very creamy middles though!) Good, but not quite. Baking soda starts softening the outside right away, long before the middles are cooked.
When it comes to ridiculously creamy restaurant style mashed potatoes, there's not much to it. The secret is just loads of cream and butter. The creamier the mashed potato, the more cream and butter it has in it!
A potato ricer is widely regarded as the best tool for mashed potatoes that are smooth and fluffy.
During harvest and storage, "When exposed to light, potatoes manufacture increasing amounts of chlorophyll as well as two bitter-tasting alkaloid compounds, solanine and chaconine" especially prolonged exposure to light with improper handling and storage.
To help offset the PH neutrality of potatoes and keep them from turning gray, here are some other secret ingredients… add in something acidic such as a teaspoon of concentrated lemon juice, white wine vinegar, cream of tartar or even a vitamin C tablet.
Just like you might use a squirt of lime juice to keep guacamole from browning, a bit of lemon juice or white vinegar in the bowl with the potatoes will ward off gray hues. Use one teaspoon to a half gallon of water to get all the anti-browning impact with no noticeable flavor changes.
Once your cooked potatoes smell bad, sour, or moldy, that's a clear sign that their next destination is the trash as they're no longer safe to eat.
"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.”
Use sour foods
Apart from this, you can also remove the sweetness of potatoes by using common salt while boiling potatoes in water.
If your potatoes have been growing in very dry soil, the potatoes themselves will have a fairly low moisture content when harvested. What this then means is that when the potatoes are build they absorb more water and fall to pieces quite quickly.
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.
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.
Whipped or Mashed, Just Don't Overwork
Starch is released when potatoes are mashed, smashed, or whipped, and, if too much starch is released, the potatoes are gummy and unappealing. Limit the amount of time you handle the potatoes, mashing or whipping only until the potatoes reach the desired consistency.
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.
Whisk a little cornstarch into the warm potatoes, only a teaspoon at a time, until the potatoes thicken to your liking. The potatoes must be warm. You can also use tapioca starch or potato starch, although most cooks are less likely to have those products on hand.