Water spinach has more names than almost any other Asian vegetable: kang kong, ong choy, water convolvulus, water morning glory, and swamp cabbage. In mandarin, it is known as 空心菜 (kong xin cai).
It grows easily even under difficult conditions. It is cheap and is widely used in Southeast Asian cuisine. It can be seen in humble home-cooked dishes as well as in high class restaurant fare. It is related to the morning glory which is a very common wild plant with purple, pink or white flowers. I used to see these purple flowers growing on fences. My parents told me that they can be eaten but we have never tried it.
Kang kong has long hollow stems. Leaves are long and pointed. The stems are crunchy and the leaves are mild tasting.
It is rich in iron and vitamin A. It lacks the bitterness of other iron-rich greens such as the spinach which is why it is so popular.
It is quite good for people with diabetes, and high cholesterol but not so great for people with low blood pressure and weak digestive systems.
How to Cut Kangkong
Water spinach are usually sold in bundles with the roots already removed. Like normal spinach, it shrinks significantly when cooked so don't worry if you think you got a big bunch.
I was taught by granny to take each plant and pinch the stems into roughly 2-inch pieces starting from the top. The lower ends of the stems are quite tough and fibrous so they are mostly discarded. I like to make sure that there are 2-4 leaves on each piece. The faster way is of course to use a knife. Trim off the ends and the more fibrous stems. Then cut into 2 or 2.5 inch pieces.
Soak them in a big tub to loosen any dirt or soil on the stems and leaves. Throw any wilted leaves away.
Cooking Idea 1: Add to soups
Water spinach is great in quick boiled soups. Clean and prepare as mentioned above. Add them to the soup in the final stages and cook till the vegetables are done. Do not overcook as they turn an unattractive dull yellow or grey if simmered for too long.
You can add them to any clear soups, quick or slow cooked. Just add them last and cook till done. It is a great way to add bulk, fibre and micro-nutrients to your food.
Famous local soup dishes featuring water spinach include prawn noodle soup, curry laksa and yong tau fu soup (aka stuffed vegetable soup) 酿豆腐 (niang dou fu).
Cooking Idea 2: In Stir-fry
This leafy vegetable is also great in quick stir fries. Fry it simply with garlic and shallots for a clean taste. But this is usually too plain for the Southeast Asian palate.
Recipe: Garlic Kangkong Recipe
A big bunch of water spinach
2 cloves garlic, minced
1 tbsp ginger, julienned
1 tbsp red chilli, julienned
salt and pepper
Cut and wash the water spinach into 3-inch pieces
Heat some oil in a wok
Add the garlic and ginger
Fry until they are fragrant
Add the water spinach and fry them until it softens and shrinks
Add the soy sauce, salt and pepper to taste
If stir-frying with garlic and oil is too boring for you, you can try pairing it with some strongly flavoured condiments.
1. Sambal Belachan
Belachan is a strongly fermented shrimp paste fried with ground chilli and oil.
Stir-fry water spinach with sambal belachan and you get a dish called "Sambal Kang Kong. It has a poetic name in Chinese "马来风光" (ma lai feng guang) which means a Malay scenery. I dare say this is a ubiquitous dish in Singapore. There is a really great recipe over at the Meatmen's if you are keen to try cooking it.
2. Pickled bean curd 腐乳 (fu ru)
Another classic condiment for stir-frying is white pickled bean curd . This is very salty, tart and soft. The bulk of the vegetable seems to take away the sharpness and tartness of the fermented bean curd leaving a nicely balanced and nuanced dish.
We like to serve fermented tofu with plain white rice congee. There are basically 2 types: red and white. There are some variations depending on the ingredients added during the fermenting process. The white one typically has a milder flavour.
Recipe: Water spinach with fermented tofu stir-fry
200g water spinach
2 pieces of white fermented tofu 腐乳 (furu)
1 tsp chopped garlic
4 small red chillies
1/2 tbsp light soy sauce
1/2 tsp sugar
1 tbsp water
Cut the water spinach into small sections. I usually use my hands to pinch sections off. Start from the top and pinch a section of stem containing a few leaves and keep going until only the stalk is left. Discard the stalks
Wash thoroughly and drain in a colander
Slice the chillies, remove the seeds and cut into small pieces,
Heat 1 tbsp cooking oil in a wok and gently fry the garlic, fermented tofu and chillies until fragrant
Add the vegetables and seasonings and stir fry quickly until well combined. I would do a taste test first before adding the soy sauce. Depending on the saltiness of the fermented tofu used, it could already be sufficiently salty without the soy sauce.
Plate and serve hot with steamed rice
The next recipe contains no bizarre or exotic ingredients. Just plain ground pork, garlic and red chillies.
Recipe: Kang Kong with ground pork stir-fry
250g water spinach
150g ground pork
5 small red chillies
1 tsp chopped garlic
1 tbsp shaoxing 绍兴 wine
2 tbsp cornstarch solution
1/2 tbsp oyster sauce
1 tsp light soy sauce
1 tsp sugar
Remove the roots of the water spinach and cut into finger-length sections
Wash thoroughly and drain dry
Wash the chillies and slice thinly with seeds removed
Slice the shallot thinly
Mix 2 tbsp cornstarch powder with 2 tbsp water
Bring a pot of water to a boil, add some sugar and cooking oil into the water
Blanch the water spinach for a few minutes
Remove and drain well
Arrange the water spinach on the serving plate
Heat 2 tbsp cooking oil in a wok, and fry the shallots until crispy
Remove from oil and keep aside
Add the chopped garlic, ground pork and chillies and fry till the mix is fragrant
Mix the ingredients of the seasonings together and add to the wok
Stir fry to mix and add the cornstarch solution and the shaoxing wine
Remove the ground pork from the heat and spread it on top of the water spinach
Sprinkle the deep fried shallot
Serve hot with steamed rice
Cooking Idea 3: Add to salads
The leaves are mild tasting and the stems are crunchy so they are quite suitable in salads. Blanch them quickly and drain before use.
There is a popular local salad known as "Cuttlefish Kang Kong" featuring fresh cuttlefish, blanched leaves and a spicy sweet dark sauce and coarsely ground peanuts.
There you are, all I know about water spinach. I hope you will give this Southeast Asian vegetable a go with the recipes and tips featured here.
How to grow water spinach
There are two ways to grow water spinach. From seeds and from cuttings.
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