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

Tong Sum and Red Date Tea

I caught an interesting cooking show on TV last night. On Astro's Asian Food Channel (Channel 703), I watched a show on TCM. It was a Taiwanese programme where the host and hostess spoke in Mandarin and sometimes a smattering of Taiwan Hokkien. The show featured 3 recipes each segment, using TCM herbs with the herbalist host explaining about the uses of the specific herbs. Then the lady hostess would cook up a dish, usually a main course, using the herbs. While I am not very interested in making dishes like prawn balls with Chinese herbs (it seemed just too much work!), I liked the 2 other recipes they showed. One was a milk beverage with herbs (I can't recall what now). But the other one was easy. A tong sum and red date tea. Tong sum or dang shen is a mild herb which resembles a dry, gnarled twig the size of a finger. It is called the poor man's ginseng in some instances because it shares similar properties with the more expensive ginseng. Dang shen is actually a root wh

24 Herb Tea - Bitter, Foul-Tasting But Oh So Good For You!

Was out running a couple of errands this entire afternoon and ended up buying groceries at the nearby supermarket. If I had a choice I wouldn't go into this decade-old supermarket because it's small, cramped and you tend to knock into other shoppers with your trolley (yes, the aisles are that narrow). Nic and I figured that we might as well buy our groceries since we were in this vicinity and he did need some coffee. Finally we ended up with a trolley full of cheese, butter, coffee and noodles. Anyway, I was getting thirsty after all the errands and shopping. We decided to stop and have a drink at this stall which sells Chinese herbal tea. This uncle who mans it is actually a Hong Kong native who has been living in Malaysia for a long time. He drives a little white van which he parks at the corner of a junction and opens up for business. You see, he sells hot and cold Chinese herbal teas of all types - the kind that is slowly boiled and brewed. It's common to see Mal

Snow Fungus, Longan, Goji Berry & Red Date Dessert For Lungs & Liver

Just last week I made this dessert because I was rummaging in my kitchen and found some snow fungus. This is a classic dessert that any Cantonese would know. I was just surprised at myself that I haven't made this dessert in a long time. Maybe because I didn't have the key ingredient - snow fungus - at hand! What is Snow Fungus?  It is technically a fungus that grows on dead bark or tree stumps just like wood ear fungus.  Snow fungus or silver ear, snow ear or white wood ear is known as Tremella fuciformis and yes, it is an edible fungus. The pleasanter term is mushroom if that makes you feel better. As most mushrooms go, they contain vitamin D, zinc, calcium, and folate.  Benefits of Snow Fungus Snow fungus is said to have anti-ageing effects due to the presence of superoxide dismutase , an enzyme that acts as a potent antioxidant throughout the body, particularly in the skin. It is best known in TCM for nourishing the lungs and we know how important this fact is right now whe