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What are Water Chestnuts?

Mary McMahon
Updated May 17, 2024
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The water chestnut, also known as Eleocharis dulcis, is a type of aquatic plant cultivated for its edible root. These roots are a staple of Chinese and Asian cuisine, thanks to their delicate flavor and crunchy texture. They are also used in fusion cuisine, and sometimes appear in surprising places. Asian markets stock them in several forms, and some grocery stores carry them as well, depending on demand.

Many Western consumers are only familiar with canned water chestnuts. Fresh ones, when they are available, are a completely different experience. The crunchy texture may be similar in both, but fresh roots are sweeter, with layers of flavor that are obscured during the canning process. The flesh of the vegetable also has a slightly different texture, with fresh water chestnuts being more brittle and prone to shattering, rather than slightly slimy like their canned cousins. They can also be found in pickled form at some markets, and the flesh is sometimes ground to make flour. The flour can be somewhat expensive, but it is well suited to certain Asian dishes.

The preferred growth environment for water chestnuts is stagnant or slow moving water. They tend to prefer ponds and lakes, although they will also grow in sluggish streams. The roots require about seven months to mature, and the plants prefer to be warm, so they are almost exclusively cultivated in semi-tropical environments. The plants are classified as sedges, thrusting grasslike leaves above the water while rooting in the mud below.

In cooking, water chestnuts are used in a lot of dishes to add texture and flavor. They have a faintly sweet flavor that will be retained through cooking, along with the crunchy texture. Unlike many vegetables that soften as they are heated, these roots stay firm, adding a crunchy mouthfeel to the dishes they are included in. In addition to Asian foods, water chestnuts go well with stuffings and in salads, and can be eaten raw or cooked.

When selecting fresh water chestnuts, if they are available, look for plump specimens without any sign of wrinkling. The outer skin should be dark brown and lustrous, and when cut open, the inside will be bright white. Fresh roots can be stored under refrigeration in water for up to one week before use. Canned ones can be kept in a cool dry place until they are opened, after which they should be rinsed and used within a few days.

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Mary McMahon
By Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a WiseGeek researcher and writer. Mary has a liberal arts degree from Goddard College and spends her free time reading, cooking, and exploring the great outdoors.

Discussion Comments
By indigomoth — On Jun 06, 2011

A waterchestnut is one of those vegetables that looks quite intimidating when you first get it from a farmers market or where ever. Unpeeled, they look really ugly, with a thick, dark skin like a bulb.

I found them to be an acquired taste as well. I tried a stir fry with water chestnuts but they didn't do much for me.

Then I found a recipe for bacon wrapped water chestnuts and I was sold after that. You can find similar recipes online. It's kind of nice to know that the chestnut doesn't have many calories, so it kind of makes up for the bacon.

Frozen (and thawed) water chestnuts can be used for this if you don't want to use canned.

By croydon — On Jun 05, 2011

Water chesnuts can be quite tasty, although the crunchiness can catch you off guard if you are expecting a soft, cooked vegetable.

They are particularly good just peeled and eaten raw, and contain very few calories.

I also really like them in stir fries. Just slice them up thinly and cook them with the rest of the veges. Remember that they will keep a little bit of crunch, so don't overcook them. You can put in a bit of soy sauce or fish sauce, but they can be overpowered by too much flavor so go easy on it.

Mary McMahon
Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a...

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