Quick Answer: What Is Water Spinach?
Water spinach, or Kong Xin Cai (空心菜, kōng xīn cài), is a morning glory family vegetable with edible leaves and hollow stems. Ong choy is a common market name.[1]
- Flavor: Mild, slightly sweet greens with a less earthy taste than ordinary spinach.[3]
- Types: Green stem and white stem forms differ in leaf shape and stalk thickness.[2]
- Uses: Garlic stir fries, fermented tofu stir fries and seafood-seasoned preparations.[2]
- Preparation: Wash, remove tough bases and cook; keep the tender stems rather than discarding them all.[1][5][6]
This guide concerns the fresh vegetable, not instructions for cultivating it or harvesting wild plants.
The hollow stalk is the useful clue at the market. It is also the reason to think beyond a pan of soft leaves: water spinach brings two textures to the same vegetable dish.
Flavor, Hollow Stems and Tender Leaves
Tender stems stay crunchy beside softer leaves.[1] Furu (腐乳, fǔ rǔ), or fermented tofu, supplies a rich, savory seasoning.[3]
A fermented tofu preparation belongs naturally beside other dishes in a Cantonese meal. The bean curd becomes sauce rather than the main ingredient.[3]
Green Stem and White Stem Types
Compare the stalks as well as the leaf shape.[2]
| Tipo | Forma habitual |
|---|---|
| Green stem water spinach | Greener, slimmer stalks with narrow leaves. |
| White stem water spinach | Paler, wider hollow stalks with broader, arrow-shaped leaves. |
White stems are often tender; check green stalks carefully for tough portions.[2]
Three Chinese Ways to Cook Water Spinach
- Garlic stir fry: Use garlic and light seasoning for a simple green side dish.[2]
- Fermented tofu stir fry: White fermented bean curd, garlic, chili and rice wine make a savory sauce. Adjust for the cubes’ saltiness.[3]
- Seafood-seasoned stir fry: XO sauce or dried scallops add savory depth. These versions contain seafood.[2]
How to Prepare Water Spinach for Stir Frying
Have the greens and seasoning ready before heating the wok. The stalks and leaves can be handled separately so the leaves do not spend the whole cooking time waiting for thicker pieces.[4]
- Wash: Rinse thoroughly under clean running water, opening the bunch so water reaches the leaves and stems. Do not use soap or produce detergent.[5]
- Trim and divide: Remove hard stem ends, cut into manageable pieces and separate thicker stalk sections from the leafy parts.[2][4]
- Drain and arrange: Drain well and mix the sauce before heating the wok.[3]
- Cook and serve: Follow a complete recipe, starting thicker stems before leaves where directed. Cook thoroughly and serve promptly; a vivid green color alone is not a food safety test.[4][6]
Buying and Keeping It Fresh
Look for a fresh-looking bunch rather than wilted leaves and tired stalks. Store unwashed water spinach in the refrigerator crisper in an unsealed bag. A damp paper towel helps retain humidity; plan to use the bunch soon.[1]
FAQs About Water Spinach Ong Choy
Is water spinach the same as regular spinach?
No. It is Ipomoea aquatica, a morning glory relative. The similar English name does not make it ordinary spinach.[1]
Can you eat the stems?
Yes. Keep tender stalks and trim away fibrous bases.[1][2]
Which type should I buy?
Choose the fresher bunch. Both green stem and white stem forms work in Chinese cooking.[2]
Can I serve it raw?
For the preparations here, cook it thoroughly. Washing helps remove surface contamination but does not replace cooking as a control against foodborne parasites.[5][6]
Fuentes
[1] Sang Lee Farms. Ong Choy
[2] The Woks of Life. Water Spinach: What It Is and How to Cook It
[3] Red House Spice. Water Spinach Stir Fry
[4] Everyday Gourmet. Stir Fried Water Spinach
[5] Centre for Food Safety. Pesticide Residues in Food
[6] Centre for Food Safety. Biological Hazard in Food: Parasites