The baking soda is clutch, as it alkalizes the water/potatoes and contributes to the crunch effect. The salt goes both in the water and on the potatoes for maximum seasoning. A big glug of olive oil makes them super crunchy and that fat gives the super high heat something to work with.
The moisture helps create a craggy coating that, when fried, yields lots of crunchy morsels to bite into. But the baking powder is key, because it acts like a salt. It helps draw moisture to the surface, where it can evaporate.
Baking powder, it turns out, is good for quite a lot more than baking. The slightly alkaline mixture raises the skin's pH levels, which allows proteins to break down more efficiently, giving you crisper, more evenly browned results.
The soaking, Mr. Nasr said, is the secret to the crisp texture of the fries. It draws out the starch, making them more rigid and less likely to stick together. The cooks fry them twice, first blanching them until slightly limp in peanut oil heated to 325 degrees, and again in 375-degree oil to crisp and brown them.
Improperly cooked french fries are limp, greasy, or soggy and often over-browned. These problems all arise from the improper handling of starch and sugar when exposed to high heat.
Why vinegar? The acidity of the vinegar holds the potatoes together so they don't get mushy and fall apart while boiling.
A pinch of baking soda can help produce crispy fried foods. It reacts with the acid in the batter to create carbon dioxide bubbles. These lead to an airy batter and a crisper, fluffier result.
INGREDIENT TIP: Remember, the secret to getting that deep-fried taste and crispiness comes from adjusting the oven temperature and using baking powder, NOT baking soda. Only baking powder will do!
Baking soda is pure sodium bicarbonate, a fine white powder that has many uses. You may wonder about bicarbonate of soda vs. baking soda, but they are simply alternate terms for the same ingredient. If your recipe calls for bicarbonate of soda, it is simply referring to baking soda.
Cornstarch is better for making things crispy as it helps to create a crispy and golden brown exterior when used as a coating before frying. Baking powder, on the other hand, is not suitable for making things crispy as it is a leavening agent that is used to make baked goods rise and become fluffy.
The baking powder raises the pH of the surface, allowing it to crisp better*), and tossing in plain cornstarch to absorb some surface moisture and create a rougher texture for the batter to adhere to. *See more on the science of baking powder and chicken wings in this article on oven-fried buffalo wings.
Baking soda is an effective option for removing grease stains because it easily absorbs excess oil.
Their website states that “The suppliers we work with first peel, cut and blanche the potatoes. They then dry, partially fry and quickly freeze the fries for our restaurants. Once in our kitchens, we cook them in our canola-blend oil so you can have them crispy and hot—just the way you like them.”
Blanching: The Reason Why French Fries Taste Better
Your potatoes need to take two separate dips in hot oil to reach restaurant quality. Oil-blanching is a two-part process that reduces the moisture and starch content in your fries, helping them crisp up.
Substituting for baking powder is a little more complicated. If you have baking soda, but you don't have baking powder, you'll need to use baking soda plus an acid, such as cream of tartar. For every teaspoon of baking powder, you'll want to substitute in ¼ tsp of baking soda with ½ tsp of cream of tartar.
Baking soda changes the texture of baked goods by causing a batter or dough to spread, while baking powder produces light, fluffy texture. Some recipes may call for baking soda or baking powder on their own, while others may require both ingredients to create the ideal balance for great texture.
Since baking powder already contains an acid to neutralize its baking soda, it is most often used when a recipe does not call for an additional acidic ingredient.
Early after an ingestion of too much baking soda, vomiting and diarrhea are common as the body tries to correct the high sodium concentration by pulling more water into the digestive tract. After absorption, high sodium concentrations can cause seizures, dehydration, and kidney failure.
Use a small amount of an acidic condiment such as lemon juice or vinegar to neutralise the soda. If the recipe has chocolate, simply add half a teaspoon of cocoa powder to it. Buttermilk can also be used to counter the pungent taste of baking soda.
One trick to keep in mind is that both baking powder and baking soda gives rise, but baking soda also spreads due to its leavening strength in small amounts.
Before all that, though, the secret is to briefly poach them in boiling water (or "blanch" them) before they go into the hot oil. This ensures that the fries are cooked all the way through before getting crisped up in the fryer.