Skip to main content

Why Does Watercress Soup Become Bitter?

My friend, Jo, asked me this question about making watercress soup.

She says that her watercress soup turned out bitter. When it comes out bitter, it is really a waste of time and money (and appetite too) as no one will touch the soup.

UPDATE: Alan Bergo left me an interesting comment about bitter watercress. Please see his comment below this post. 

Naturally I have come across this "bitter watercress soup" puzzle once. Yes, even I - I who profess to know my soups. Actually I am still learning. I am curious about soups and so this question by Jo niggled me to no end.

Many years ago, I made a pot of watercress soup and strangely, it didn't taste good at all. It had hints of bitterness. I never really got around to investigating why until Jo asked me this question again.

Now that I am a lot better at making Chinese soups, I started to think of whom I could ask.

Two people come to mind.

The woman who sells vegetables at the market. She's a friendly matronly type, a grandmotherly soul. She would know.

And then there was my balding and ever cheerful Chinese uncle herbalist at the very same market. (Gosh I love this market. I was just remarking to Nic how lucky we are to live in this area where the market people are truly helpful and lovely.)

Anyway - I asked the daughter-in-law of my favourite vegetable seller (the woman wasn't around today, unfortunately). Now she tells me that the cardinal rule of making 'sai yeong choi' or watercress soup is this - your pot of water MUST BE BOILING before you add watercress.

If you add watercress into the water which is warming up or even cold water, your soup will turn out bitter.

That's it.

That's the thing you have to remember.

In all my soup-making days, I always bring water to boil first. I never add ingredients to cold water in a pot.

I will verify this again with her mom-in-law when I do see her in the market but this daughter-in-law of hers is also an experienced cook and she has been helping her mother-in-law sell vegetables for a long time.

Now you know why your pot of water must be boiling before you add your soup ingredients.

Note: She also mentioned that if you are making soup with matrimony vine leaves, you cannot overboil the leaves. If you do overboil them at high heat, the soup will also end up bitter and nasty.


Comments

Anonymous said…
Yes, but don't you kill all the nutrient value of the Watercress by boiling it? Though, i'm in search of having watercress without such bitterness, I may just give this a shot.
Alan Bergo said…
Whether your water is boiling or cold has nothing to do with bitterness, sorry. It could be due to when and where the watercress is harvested, as older water cress is higher in sun-induced flavonoids that increase the hot flavor as the plant matures and attempts to flower/go to seed. Typically store-purchased watercress, if it is truly Nasturtium officionale, as opposed to an upland cress (Barbarea spp and others) is harvested quite old and spicy hot.
Krista Goon said…
HI Alan - Thanks for your comment. I stand corrected then.
Krista Goon said…
Hi Anonymous: Please see Alan Bergo's comment below this. He says it has nothing to do with boiling but when and where the watercress is harvested.
Anonymous said…
Dog simple and plain as a significant majority of nutrients 50 to 70 percent will be lost stop sugarcoating the truth, Its still better than raw watercress flavor, but if you want the full nutritional content of a food without bitterness you must dry them into a powder, if it still taste bitter mix it into a smoothie.
I made 2 pots of soup with 1 bunch of watercress, 3 days apart. Day 1 soup wasn't bitter but day 3 soup was. Same method both times, inside a pressure cooker for 40min. Except day 3 soup,i did not saute it after releasing the pressure and adding salt. Day 3 soup was bitter. Day 1 soup was delicious. Could the post-pressure sauteing make a difference?

No idea...
Krista Goon said…
Hi there! I have not used a pressure cooker for making watercress soups so I can't say if there's any difference sauteing or not. Interesting outcome though and I really want to figure out why sometimes watercress soups get intensely bitter. Did you let the soup come to a boil first with the pork bones before you added the watercress?

Popular posts from this blog

Goji Berry, Chrysanthemum & Red Date Tea

I've been making this simple tea for a few times already. Not sure if I had shared this before but all it needs are 3 ingredients - dried goji berries, dried red dates and dried chrysanthemum bulbs. This sugar-less concoction is good for health especially if you want to maintain immunity. It's even more important these days what with the pandemic and Covid-19. But it is also a pleasant brew - no boiling needed. All you need is a handful of goji berries (washed and soaked for 5 minutes in water), 3-5 large dried red dates and a teaspoon of dried chrysanthemum flowers (these are the small heads of flowers, not the usual type for making chrysanthemum tea). Put all the ingredients in a teapot and pour in boiling water. Let it sit for 10 minutes and voila, you have made yourself a healthy tea without sugar. It has a natural sweetness from the red dates and goji berries. And once you have drunk all the tea, you can continue adding more boiling water for a second b...

The Remarkable Nut of Nuts

In this recipe, walnuts and dried red dates are combined to make a healthy and life-giving dessert. And with honey added, it packs a punch. A truly simple dessert which is used to prevent the usual flu magnets - colds and coughs. It helps too with your kidneys and with bowel movement. Walnuts are much revered in Chinese medicine, not least because the nut resembles the brain! Again, the Chinese believe that walnuts are good snacks for children as they help boost brain power which is true because of the high amounts of Omega 3 fats (good for the brain). Walnuts are of course a good source of essential omega-3 fatty acids and in Roman times, considered the food of the gods. Walnuts are a 'yang' tonic and useful for toning up weak kidneys. It also warms lung Qi while acting as a laxative, moistening the intestines (hence encouraging bowel movement if you are constipated). Walnuts are called Hu Tao Ren (juglans regia) in Chinese medicine. Walnut & Red Date Dessert 150 gm walnut...

Corn Silk That You Should Never Throw Away

The next time you buy fresh corn still in its husk, you should never throw away the corn silk. Most people throw away the husk and silk, thinking that they're useless but I can tell you, corn silk is great for your body. Save the corn silk to make a healthy tea. Just place all the silk into a pot, cover with 500ml of water and simmer for 10 minutes on low heat. Turn off the heat and pour yourself a steaming cup of sweetish corn silk tea that tastes a little like corn.  Corn silk or Yu Mi Xu is a natural corn fibre that is also used in Native American medicine. It contains flavonoids that give corn silks their colour and have antioxidant properties.  I t is considered an important medicinal plant, able to induce diuresis and excrete dampness according to TCM.  Corn silk is helpful towards Kidney, Bladder, Liver and Gall Bladder. meridians Therefore it clears damp heat, bloating, rheumatism, skin eruptions, gout, wasting and thirsting disorder, hepatitis, cholelithiasis, ch...