Nervilia and Water Chestnut Fluid-Generating Soup: Recipe & Benefits

Nervilia fordii and Water Chestnut Fluid-Generating Soup (Qingtiankui Mati Shengjin Tang)

Introduction to Medicinal Diet

Nervilia and Water Chestnut Fluid-Generating Decoction is a classic medicinal soup originating from Lingnan folk tradition, primarily known for supporting body comfort and maintaining fluid balance. Nervilia (Qing Tian Kui), also known as “Tian Kui” or “Qing Tian Kui Zi”, refers to the dried whole herb of *Nervilia fordii* (Orchidaceae). It is sweet, bland, and cool in nature, excelling at supporting body comfort, moistening the respiratory system, and promoting the body’s natural cleansing processes. Water chestnut (Ma Ti), i.e., *Eleocharis dulcis*, has white, crisp, sweet, and juicy flesh and has long been regarded as an excellent fruit for “supporting moisture balance and maintaining fluid comfort”. When combined, often with lean pork or pork ribs to enhance umami, the resulting soup is clear in color and sweet in flavor, particularly suitable for consumption during dry seasons or for supporting recovery after temporary seasonal imbalances.

This soup is widely popular in the Guangdong and Hong Kong regions, where it is commonly regarded as a representative “clear-moistening soup” in folk tradition. The herbaceous fragrance of Nervilia fordii (qingtiankui) blends harmoniously with the sweet crispness of water chestnut (Eleocharis dulcis), not only offering a pleasant taste but also subtly supporting fluid balance and alleviating temporary dryness sensations. Compared to nourishing soups made with a large quantity of medicinal herbs, Nervilia and Water Chestnut Fluid-Generating Soup focuses more on “gentle support” and “moistening nourishment” effects, with gentle properties suitable for daily household wellness maintenance.

Efficacy of Medicinal Diet

The core benefits of Qingtiankui (Nervilia fordii) and Water Chestnut (Eleocharis dulcis) Fluid-Generating Decoction lie in “supporting body comfort and fluid balance, and promoting respiratory and throat comfort.” Qingtiankui supports the body’s natural cooling processes in the respiratory and digestive systems, promotes healthy tissue integrity, and helps maintain normal tissue function. Water Chestnut excels at supporting comfortable hydration, quenching thirst, and promoting digestive comfort. When used in combination, they help relieve symptoms such as occasional dry mouth and tongue, temporary throat discomfort, dry cough with occasional phlegm, and occasional digestive sluggishness associated with temporary heat or fluid imbalance. Additionally, the mucilaginous substances and various vitamins abundant in this decoction directly nourish the throat mucosa, helping to alleviate discomfort due to “temporary internal heat sensations.”

From a modern nutritional perspective, water chestnuts (Eleocharis dulcis) are rich in puchiin, dietary fiber, and minerals, offering support for a balanced microbial environment, maintaining healthy blood pressure levels, and promoting healthy intestinal motility. Nervilia fordii (nervilia) contains multiple bioactive components that may help support the body’s healthy inflammatory response and respiratory comfort. Therefore, this soup is not only suitable as a dietary aid during recovery from temporary seasonal imbalances but also for daily consumption by individuals with pronounced “dryness” patterns—such as long-term smokers, those who overuse their voice, or people frequently exposed to air-conditioned environments—helping to maintain moisture and health of the respiratory tract.

The Functions of Traditional Chinese Medicine

In TCM theory, “Jin Ye” (Body Fluids) are essential substances for maintaining vital life activities, serving to moisten and nourish, support healthy blood formation, and promote overall balance. *Nervilia fordii* (Qing Tian Kui) is sweet and bland in flavor, cool in nature, and enters the Lung, Stomach, and Liver meridians. It supports respiratory comfort, helps maintain the body’s natural cleansing processes, and supports healthy circulation. *Eleocharis dulcis* (Water Chestnut, Ma Ti) is sweet in flavor, cold in nature, and enters the Lung and Stomach meridians. It excels in supporting body comfort and fluid balance, promoting respiratory ease and visual comfort, and supporting healthy digestion. The combination of these two herbs, both sweet and cold in nature, simultaneously supports the body’s natural cooling processes in the respiratory and digestive systems, while nourishing the body’s fluid balance. This ensures that temporary heat sensations are addressed without disturbing the body’s natural equilibrium, and fluids are maintained without retaining unwanted substances—demonstrating the synergistic principle of “supporting cooling without disturbing digestive comfort, and maintaining fluids without lingering imbalances.”

In this formula, *Nervilia fordii* (Green Tian Kui) is light, clear, and penetrating, excelling at supporting the Upper Body to address temporary heat sensations in the respiratory system, promoting healthy tissue integrity, and supporting normal tissue function. *Eleocharis dulcis* (Water Chestnut) is sweet, cold, and moist in nature, able to support the body’s natural cooling processes in both the respiratory and digestive systems, maintain comfortable hydration, and promote digestive regularity. The two herbs act synergistically—one supports while the other moistens, one disperses while the other gathers—allowing temporary heat sensations to be addressed externally while fluids are supported internally. If the individual also presents with occasional phlegm that is difficult to expectorate, the tissue-supporting and phlegm-supporting action of *Nervilia fordii* complements the digestive-supporting and phlegm-supporting effect of *Eleocharis dulcis*, facilitating overall respiratory comfort. For individuals in the later stages of temporary seasonal imbalance with general weakness and unresolved residual heat sensations, this decoction can serve as an adjunctive nourishing remedy to “support balance and promote overall vitality.”

Analysis of Medicinal Properties

Nervilia fordii (Qing Tian Kui) has a light and loose texture, allowing its active constituents to be easily extracted during decoction. Its cooling-supporting action primarily targets temporary heat sensations in the respiratory and digestive systems, and also provides auxiliary support for occasional eye discomfort associated with temporary heat sensations, as well as healthy skin condition. When consumed raw, water chestnut (Eleocharis dulcis; Ma Ti) has a stronger effect in supporting body comfort and fluid balance; when cooked, it focuses on nourishing the digestive system and promoting healthy bowel function. Therefore, in this soup, the water chestnuts are prepared using the method of “crushing first, then cooking”, which both preserves their gentle moistening nature and facilitates the release of active substances, resulting in a more balanced effect of the soup.

Indications

This soup is neutral and gently moistening in nature. It is mainly suitable for the following groups of people: First, those in the later stages of temporary seasonal imbalances or after external stressors presenting with symptoms of “fluid imbalance” such as occasional dry mouth and throat, drinking without satisfying thirst, occasional loss of appetite, and concentrated urine. Drinking this soup as a substitute for tea frequently can help support fluid balance. Second, individuals with long-term smoking, alcohol consumption, or those staying in dry environments (such as air-conditioned or heated rooms) who often experience temporary dryness sensations manifesting as occasional dry throat, nasal dryness, or dry cough without phlegm. Consuming this soup 2–3 times per week can provide excellent moistening and protective support against temporary dryness.

Moreover, the Nervilia fordii and water chestnut fluid-engendering soup (Qingtiankui mati shengjin tang) also provides good support for occasional throat discomfort and hoarseness associated with temporary heat sensations. For children presenting with occasional bad breath, digestive sluggishness, and concentrated urine resulting from temporary internal heat sensations, the soup may be consumed in moderation (with the dosage of Nervilia fordii reduced by half). For the general population, especially during the transition from summer to autumn when the climate is dry, using this soup as a regular household remedy helps support overall comfort during seasonal changes.

Contraindicated groups

Although the Nervilia fordii and Water Chestnut Fluid-Generating Decoction is balanced in nature, it should still be used with caution or avoided by the following groups: those with a tendency toward cold sensations and digestive weakness should drink it cautiously. Nervilia fordii is cool in nature, and Water Chestnut is cold in nature; when combined, if the individual habitually presents with aversion to cold and cold extremities, loose stools, poor appetite, and an abdomen that prefers warmth and pressure, overconsumption of this soup may disturb digestive comfort and aggravate cold sensations. If such individuals wish to consume it, it is recommended to add peeled and sliced fresh ginger (Zingiber officinale, 3–5 slices) to cook together with the ingredients in order to balance its cool nature.

Pregnant women and those in their menstrual period should also exercise caution. Although Ford’s Nervilia (Nervilia fordii) does not have a strong effect on circulation, pregnant women’s constitution is special, and dietary aids should not be used casually unless necessary; for menstruating women, if their body constitution tends to be cold, consuming cool-natured soup may lead to menstrual discomfort. Additionally, individuals allergic to Ford’s Nervilia (Nervilia fordii) or water chestnut (Eleocharis dulcis), infants (under one year of age), and those currently taking warming dietary supplements are advised to consult a professional healthcare practitioner before deciding whether to consume this soup. The soup should not be taken in large quantities continuously over a long period; generally, 2–3 times per week, with 1–2 bowls per serving, is recommended.

Ingredient formula proportions

The following is the precise formula for “Qingtiankui Mati Shengjin Tang” (Nervilia fordii and Water Chestnut Fluid-Generating Decoction) (for 4 servings, approximately 250 ml per bowl):

Dried Nervilia fordii (Ford’s nervilia) 15–20 g (if using fresh, double the amount to 30–40 g) Fresh water chestnuts (Eleocharis dulcis) 250 g (about 8–10 pieces, net weight after peeling approximately 200 g) Lean pork 300 g (pork spine bones or pork ribs can also be used; lean pork is more moistening and clear) Fresh ginger (Zingiber officinale) 3 slices (about 2 mm thick) Honeyed jujube (Ziziphus jujuba) 2 pieces (optional, to enhance sweetness and support digestive comfort) Table salt a pinch (for final seasoning)

If a sweeter soup is desired, you may additionally add 1 carrot (about 150 g, peeled and cut into chunks) or 30 g of fresh Phragmites communis (fresh reed root), but ensure that the proportion of main ingredients remains unchanged. Regarding herb quality, it is recommended to select dried Nervilia fordii (Qing Tian Kui) with a yellow-green color, intact leaves, and no insect damage. As for Eleocharis dulcis (water chestnuts), those with dark purple skin, white flesh, and abundant sweet juice are considered best.

Preparation method

Step 1: Prepare the ingredients. Rinse dried Nervilia fordii (Qing Tian Kui) quickly under cold water to remove dust, then soak in warm water (approx. 40°C) for 10 minutes; set aside the soaking water. Wash Chinese water chestnuts (Eleocharis dulcis) to remove soil, peel off the skin with a knife (be sure to dig out the buds), then cut each water chestnut in half or lightly crush to release flavor. Cut lean pork into 2–3 cm cubes, place in cold water and bring to a boil; skim off any foam, then remove and rinse with warm water.

Step 2: Boiling in a pot. Take a clay pot or ceramic soup pot. First, add the blanched lean meat pieces, water chestnut pieces, ginger slices, and honey dates. Then, add the soaked Nervilia fordii (Qing Tian Kui) and its soaking water. Finally, add enough fresh water to cover all ingredients by about three finger-widths (approximately 2 liters). Bring to a boil over high heat, then reduce to low heat, cover, and simmer for 1–1.5 hours, until the soup turns a clear light yellow color and the aroma of meat and herbs blends together.

Step 3: Season and finish cooking. Five minutes before turning off the heat, remove the lid and add salt (about 3–5 grams, adjust according to personal preference for a light taste). Stir well, then continue simmering over low heat until the salt is fully dissolved. If there is excess oil floating on the surface, skim it off with a spoon. Finally, strain the soup through a fine mesh sieve to remove the herbal dregs and meat bones (alternatively, the ingredients can be left in and consumed directly). Ladle the soup into bowls and drink while warm.

Consumption Tips

1. Timing and frequency of consumption: This decoction is best taken warm in the afternoon or one hour before sleep, when the body’s yin qi is gradually ascending, facilitating the absorption of its moistening and cooling properties. It is not recommended to drink large amounts on an empty stomach, as this may cause temporary digestive discomfort. Consume 2–3 times per week, and do not take continuously for more than 2 weeks, to avoid excessive cooling.

2. Flexible substitution of ingredients: If dried Nervilia fordii (qīng tiān kuí) is unavailable, substitute with fresh Nervilia fordii or “Semiaquilegia adoxoides root (tiān kuí zǐ)”, but adjust the dosage according to properties (consult a healthcare practitioner). Water chestnut (Eleocharis dulcis) may be partially replaced with sugarcane (Saccharum officinarum), peeled and cut into sections, to enhance cooling and fluid-supporting effects. For diabetic patients, it is recommended to omit honeyed jujube (Ziziphus jujuba) and reduce the amount of water chestnut, substituting with cucumber (Cucumis sativus) or winter melon (Benincasa hispida) to lower sugar intake.

3. Storage and Reheating: If a large batch of soup is prepared, allow it to cool completely before transferring it to a sealed glass container. Refrigerate for no more than 2 days. When reheating, bring the soup to a full boil and then warm it gently; do not consume it cold or reheat it directly in a microwave (as this may affect the active ingredients). If the soup develops a sour taste or becomes cloudy, it has spoiled and should not be consumed.