An Old-School Potato Recipe: Two Ingredients and A Little Bit of Chemistry (2024)

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An Old-School Potato Recipe: Two Ingredients and A Little Bit of Chemistry (1)

The first time I saw salt potatoes prepared, at a backyard barbecue in upstate New York, I was unimpressed, despite the feverish excitement of the gathered locals. My host had purchased a bag of Hinerwadel’s Salt Potatoes at Wegman’s, a local grocery chain, and as far as I could tell, it was just a five-pound bag of thin-skinned new potatoes with a 12-ounce sack of salt along for the ride. After pouring all of the salt (over 2 cups) into a pot with the potatoes and enough water to cover, it was set on the stove to boil. As the potatoes cooked, vigorously simmering for 20 minutes, droplets of the thick brine bubbled from the pot and salt crystalized on the handles of the pot and surrounding burners. The already muggy kitchen becameuncomfortably steamy. I love potatoes more than the next person, but salt potatoes seemed like a mess—and the unusual, albeit simple, cooking method seemed like we would be left with unpalatably salty potatoes.

Oncetender, the potatoes were unceremoniously drained in a colander. Steam rose, and after a few minutes, as their skins dried, the magic of cooking in brine was revealed: a thin layer of crystalized salt created a sparkly dust on the tan potato skins. The potatoes were dumped back into the salt-crusted pot and set on the table with melted sweet cream butter.

Individually dunked in butter and eaten as a finger food, the simple genius of salt potatoes became apparent. The brine boils at a higher temperature than water, so the potato flesh steams inside the skin, which acts as a barrier to the salty brine. The steamed flesh is at once fluffy and creamy, and the dried salt on the skin seasons each bite perfectly.

An Old-School Potato Recipe: Two Ingredients and A Little Bit of Chemistry (2)

Salt potatoes gained popularity in the mid-1800s, when Syracuse was a hub of salt production for the United States. Saline wells and water from Onondaga Lake, which was full of salt deposits from an ancient inland sea, bred a thriving salt industry, with a workforce made up of European immigrants. Long days and nights spent working in the “boiling blocks”—the warehouses equipped with furnaces and iron cauldrons for reducing brine to powdered salt—meant lunch was sacks of potatoes cooked in the vats of boiling brine. Necessity is the mother of invention, but did these salt workers actually invent the method of cooking potatoes in brine?

A few months ago, I was paging through chef Katie Button’s cookbook,Cúrate.I came across a recipe for salt potatoes, orpapas arrugadas—literally “wrinkly potatoes,” a descriptive name nodding toward the salt-sealed skin that wrinkles as it dries. The photo looked like an extra salty version of Syracuse salt potatoes, served with a chimichurri-esque mojo verde. Instead of cooking in terrestrial brine, these potatoes (which cameout of the Canary Islands sometime in the early 17th century) were originally cooked in sea water, which is less salty than Syracuse-style brine. So instead of draining the potatoes, some of the cooking water is poured off once the potatoes are tender. The pot returns to high heat until the remaining water evaporates, leaving a fine salt powder on the potatoes’ skins and the bottom of the pan.

An Old-School Potato Recipe: Two Ingredients and A Little Bit of Chemistry (3)

A little more research guided me to Colombian papa salada, which falls somewhere between the Syracusian and Canarian versions. From the salt mining town of Zipaquira, about 25 miles north of Bogotá, papa salada are cooked with the edible rock salt produced by the halite mines. According to food stylist Mariana Velasquez, who grew up in Bogotá, this unremarkable salt is dissolved in a clay or aluminum pot set over a wood-fired stove. The key to the dish is using a specific, waxy variety of freshly dug potato and about one ounce of salt per pound of potatoes. Their waxiness helps maintain the potatoes’ structure as they undergo a long boil. The potatoes are boiled until the brine has completely evaporated, and the cooked flesh is denser than that of a Syracuse salt potato. The salt scorches on the bottom of the pan and mingles with the wood fire to add a layer of smoky flavor to the papa salada. Served at weekend luncheon barbecues, they are accompanied by grilled meat, a simple guacamole of mashed avocado seasoned with lemon juice, cilantro, and salt, and aji, a spicy green sauce of cilantro, scallions, green chiles, garlic, and vinegar.

Each of these salt-potato birthplaceshas developed recipes that bring out the best in their regional ingredients, but my favorite resultcomes from marrying these styles and improvising based on the ingredients I have (as neither an island dweller nor a miner). Since salt is the star of this dish, you will taste all of its mineral flavors, so choose a delicious one, like sel gris or Maldon. As for the potatoes, choose freshly dug creamers or fingerlings, and serve them with an herby green sauce or melted butter.

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Mary-Frances Heck

Mary-Frances Heck is a food writer and chef. She is the former head recipe developer for Lucky Peach and test kitchen director of Bon Appétit. Her first cookbook, Sweet Potatoes: Roasted, Loaded, Fried, and Made Into Pie, will be published in the fall of 2017.

An Old-School Potato Recipe: Two Ingredients and A Little Bit of Chemistry (2024)

FAQs

What happens to the starch in potatoes when cooked? ›

During baking, as the molecules are heated and absorb the surrounding moisture in the potato, the grains swell and separate. This process of starch-grain bonding is called gelatinization, and can differ in potato varieties, depending on the size and amount of starch.

Why does boiling a potato make it soft? ›

Some food science: Potatoes (like many other starchy plants) contain hemicellulose, a carbohydrate that provides structure to the tuber. It also readily breaks down when boiled in water, lending to the creamy texture we know and love.

How to cook soft potatoes? ›

Place the potatoes in a 3- to 4-quart sauce pan and cover with cold water. Partially cover the pot and bring the water to a boil. Uncover, add 1 teaspoon of salt, and reduce the heat so that the water boils gently. Cook until the potatoes are tender when pierced with a fork, 10 to 12 minutes.

How do you use old potatoes? ›

They could still be used for mash. Alternatively, chop them in to reasonable size pieces then place in boiling water for about 8/9 min, drain them & leave to dry for a while before slicing them so they are like thick crisps / potato chips a few mm thick.

What is the chemistry of a potato? ›

Chemistry of potatoes

At first glance, a potato is a starch and water, but there are much more ingredients. It also contains amino acids, proteins, intermediate hydrolysis products of proteins, and some non-starch carbohydrates like cellulose [2]. It is also made of various enzymes and organic acids.

What is the chemistry behind mashed potatoes? ›

What's going on? The mashing is causing cells to separate from one other and this gives the mix its puréed consistency (the brick wall collapses). But if you mash for too long, the cell walls break and release their starch into the purée. The more mechanical the mashing motion, the more starch will be released.

Is cooking a potato a chemical change? ›

When a potato is cooked, heating the potato cause changes in the molecules of the potato. Therefore, upon cooking, the potato does not remain the same at a molecular level. Thus, cooking is a chemical change, not a physical change. Q.

Why are my potatoes green? ›

Information. According to the University of Idaho Cooperative Extension Service, "Potato tubers are specialized stems of a potato plant, and tubers that are exposed to light, will naturally turn green. The green is nothing more than chlorophyll, a harmless compound found in all green plants.

Why are my potatoes foaming when boiling? ›

Whenever you boil potatoes for mashing, a foam gathers at the top. There's no need to skim off this foam if you use part of the potato water for mashing the potatoes. The foam is starch that cooks out of the potatoes. Amounts vary with potato type and tend to be greater in older potatoes.

Are mushy potatoes OK to eat? ›

Raw potatoes should be firm to the touch with tight skin that's free of large bruises, black spots, or other blemishes. If a potato has become soft or mushy, you should throw it out. Though it's normal for potatoes to smell earthy or nutty, a musty or moldy odor is a hallmark of spoilage.

Why is my potato green under the skin? ›

There are technical terms for what is happening, basically the potato is producing this green as it is trying to revert back to growing a plant, and it produces chlorophyll which is not toxic. The other substance produced is called solanin, which can be bad if consumed in large quantities.

Is it OK to eat potatoes that have sprouted? ›

Sprouted potatoes that are still firm, have relatively small sprouts, and don't show any wrinkles or shriveling are okay to eat, as long as you cut off the sprouted parts and soft spots. However, there's still a chance you could get sick. If your potato is sprouted and shriveled up, then it's too far gone.

Are slightly wrinkled potatoes safe to eat? ›

Wrinkled skin is just one of many indicators that a potato is no longer safe to eat. Along with its impact on texture, an elevated concentration of solanine can cause the potato to develop a green hue. Spoiled potatoes may also emit an unpleasant, mold-like odor.

Can you freeze boiled potatoes for later use? ›

You absolutely can freeze potatoes, and you should if you have an excess of spuds. But there's one important thing to remember: You should really only freeze cooked or partially cooked potatoes, as raw potatoes contain a lot of water. This water freezes and, when thawed, makes the potatoes mushy and grainy.

How long will boiled potatoes last in the refrigerator? ›

After you've cooked potatoes, you can store them in the fridge for up to three days. You can also freeze cooked potatoes. Boil them for at least five minutes before freezing. They will last for up to a year.

How long can you keep leftover boiled potatoes? ›

Cooked potatoes and other cooked vegetables can be safely kept in the refrigerator 3 to 4 days. The United States Food and Drug Administration (FDA) regulates fruits and vegetables, if more information is needed on produce, you can call the FDA toll-free at (888) 723-3366 or go to their website at FDA (www.fda.gov).

Is it OK to reheat boiled potatoes? ›

Can you reheat potatoes? Yes, it is safe to reheat potatoes. However, they must be stored properly after initial cooking. If they are not, it can result in the growth of a bacterium known as Clostridium botulinum, which can cause a fatal disease, botulism.

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