Cogongrass Rhizome and Lean Pork Soup: Recipe, Benefits & TCM Guide

Introduction to Medicinal Food Therapy

Mao Root Lean Meat Soup is a widely circulated medicinal diet from the Lingnan region, known for clearing heat and draining dampness. It is made by slow-simmering fresh or dried Imperata cylindrica root (Mao Gen) with lean pork. Imperata root is the rhizome of the grass plant Imperata cylindrica (L.) Raeusch., classified as a medium-grade herb in the *Shennong’s Classic of Materia Medica*. It is cold in nature and sweet in taste, entering the Lung (LU), Stomach (ST), and Bladder (BL) meridians. Folk custom often involves harvesting fresh roots in spring and summer to make soup, used to clear summerheat and prevent internal heat. Lean meat provides high-quality protein, tonifies the middle and boosts qi, and nourishes yin while moistening dryness. Combining it with Imperata root both moderates the herb’s coldness and gives the soup a refreshingly sweet flavor, making it a daily health-promoting broth suitable for all ages.

This medicinal food recipe has been passed down for centuries and is particularly favored in the southern regions, where it is consumed during the damp-heat-laden plum rain season or the sweltering summer heat. Mao Gen (Imperatae Rhizoma) Lean Meat Soup belongs to the “clearing and supplementing” (清补) category in traditional medicinal cuisine. Its unique feature is “supplementation through clearing” (以清为补)—by eliminating excess heat pathogen (热邪) and dampness turbidity (湿浊) from the body, it helps the spleen and stomach (脾胃) restore their normal transportation and transformation (运化) functions, thereby indirectly achieving nourishing (补益) effects. The soup is clear with a slight yellow hue, cool and slightly sweet in the mouth, with a faint herbal fragrance. It can be served as a daily soup with meals, or used as a dietary therapy (食疗) formula for mild internal heat (轻度上火) conditions such as scanty dark urine (小便短赤).

Historical Origins and Contemporary Significance of Medicinal Diet

According to the Qing dynasty text *Shi Liao Ben Cao* (Materia Medica for Dietotherapy), Mao Gen (Imperata cylindrica root, cogongrass root) was widely used in folk medicine to “quench thirst, promote urination, and clear vexing heat.” The practice of boiling Mao Gen together with meat has been frequently recorded in health preservation literature from the Jiangnan and Lingnan regions during the Ming and Qing dynasties. Modern research has further confirmed that Bai Mao Gen (Imperata cylindrica root) is rich in various active components such as triterpenoids, organic acids, and potassium salts, demonstrating diuretic, antibacterial, and immune-enhancing effects, thereby providing a new scientific validation for this traditional medicinal cuisine.

Efficacy of Medicinal Cuisine

The main effects of Mao Gen (Imperatae Rhizoma) Lean Meat Soup can be summarized as “clearing Heat, promoting urination, cooling the Blood, and generating Fluids.” In this context, clearing Heat refers to resolving the Heat pathogen in the Lung and Stomach, providing significant relief for symptoms such as sore throat, swelling, dry mouth, thirst, irritability, and restlessness due to externally contracted Wind-Heat or a spicy diet. Its diuretic effect is particularly prominent, increasing urine output and aiding the discharge of excess internal Dampness and Heat Toxins through urination, thereby markedly improving symptoms of Damp-Heat pouring downward, including scanty dark urine, deep yellow urine, and difficult painful urination.

In terms of cooling blood and stopping bleeding, Imperatae Rhizoma (Mao Gen) and Lean Meat Soup has a certain auxiliary regulating effect on mild bleeding tendencies such as epistaxis (nosebleed), gingival bleeding, and hemoptysis caused by blood heat with reckless movement. At the same time, the lean meat in the soup can supplement the yin fluids consumed by fever or sweating, producing the effect of generating fluids and moistening dryness. This allows the body to clear heat without damaging healthy qi, achieving the ideal state of “eliminating pathogenic factors without harming the righteous qi.” Regular moderate consumption also helps improve facial acne, skin eczema, and other skin issues related to blood heat and dampness toxin.

Interpretation from the Perspective of Modern Nutrition

From a modern nutritional perspective, Maogen (Imperatae rhizoma) and Lean Meat Soup is rich in potassium, which helps maintain electrolyte balance and regulate blood pressure. The high-quality protein and B vitamins from the lean meat enhance physical strength and support tissue repair. This combination makes the medicinal food effective in clearing heat and draining dampness while also providing nutritional supplementation, aligning with the modern wellness philosophy of pursuing “effective yet gentle” health maintenance.

The Role of Traditional Chinese Medicine

From the perspective of Traditional Chinese Medicine theory, *Bai Mao Gen* (Imperatae Rhizoma, Cogongrass Rhizome) is sweet in taste and cold in nature, entering the Lung (LU), Stomach (ST), and Bladder (BL) meridians. Its core actions are “clearing heat and promoting urination” (清热利尿) and “cooling blood and stopping bleeding” (凉血止血). Being sweet and cold, it generates fluids to quench thirst; entering the Lung meridian, it clears Lung heat to relieve cough and dyspnea; entering the Stomach meridian, it drains Stomach fire to stop vomiting and thirst; entering the Bladder meridian, it promotes urination and unblocks painful urinary dribbling to drain damp-heat. For early or middle-stage warm-heat diseases presenting with fever, thirst, and difficult urination, *Bai Mao Gen* guides pathogenic heat out through urination, exemplifying the TCM principle of “providing a route for the pathogen to exit” (给邪以出路).

In TCM dietetic therapy, pork is sweet and salty in flavor, neutral in nature, and enters the Spleen, Stomach, and Kidney meridians. It has the effects of “tonifying the Kidney and nourishing Yin, enriching Blood and moistening Dryness, supplementing Qi and reducing edema.” According to *Bencao Beiyao* (Essentials of Materia Medica), pork “moistens the Intestines and Stomach when consumed, generates essence fluids, enriches the flesh and physique, and nourishes the skin,” indicating its strength in nourishing Yin fluids and supplementing body fluids and Blood. When combined with Imperatae Rhizoma (Cogongrass rhizome), the moistening effect of pork moderates the cold-natured property of Imperatae Rhizoma, preventing the gastric cold discomfort that may arise from using Imperatae Rhizoma alone. Conversely, the clear-draining and diuretic action of Imperatae Rhizoma helps keep the pork from becoming cloying and greasy. The two complement each other, allowing the formula to achieve an overall regulatory effect of “clearing the upper and promoting downward flow, nourishing the middle and pacifying the interior.” This combination embodies the refined principle of TCM medicinal cuisine: “mutual restraint of natures and mutual enhancement of actions.”

Indications

Imperata cylindrica (Cogongrass Rhizome) and lean pork soup is particularly suitable for individuals with a Damp-Heat constitution. These individuals often present with a tendency toward oily facial skin, acne and pimples, a bitter taste and dry mouth, sticky and sluggish stools, scanty dark yellow urine, and a yellow, greasy tongue coating. During the transition between spring and summer or in the damp-heavy Long Summer season, drinking this soup 2 to 3 times per week can effectively help the body clear Damp-Heat and alleviate discomfort. For those who frequently stay up late, consume spicy and fried foods, or have excessive alcohol and tobacco use leading to flaring of Deficiency Fire, this soup also provides a regulating effect by clearing Heat and resolving Toxicity, as well as nourishing Yin and moistening Dryness.

For specific symptoms such as mild urinary tract infection (frequent urination, urinary urgency, dysuria), difficulty urinating or edema, blood‑heat patterns like epistaxis or gingival bleeding, as well as vexing thirst, excessive sweating, and poor appetite during the summer‑heat season, Imperatae Rhizoma (cogongrass rhizome) and Lean Meat Soup is an ideal and safe dietary therapy. In children presenting with summer prickly heat, scanty dark urine, and irritability, a small amount may be given under medical guidance. Additionally, for hypertension classified as Liver Yang Hyperactivity or Internal Exuberance of Damp‑Heat pattern, moderate consumption of this soup can assist in lowering blood pressure and alleviating dizziness.

Contraindicated populations

Individuals with a Spleen and Stomach Deficiency Cold pattern should use caution when consuming Imperatae Rhizoma (cogongrass rhizome) lean pork soup. Such individuals commonly present with cold pain in the abdomen that prefers warmth and pressure, loose stools or undigested food in the stools, poor appetite, a pale, swollen tongue with tooth marks, and a deep, slow pulse. Ingesting the cold-natured Imperatae Rhizoma may aggravate the Spleen and Stomach burden, leading to diarrhea or abdominal pain. If its use is truly necessary, add 3 to 5 slices of fresh ginger (Zingiberis Rhizoma Recens) to the decoction to counteract the cold nature of Imperatae Rhizoma, but long-term or large consumption is still inadvisable.

Pregnant and breastfeeding women should consume this soup only under the guidance of a TCM practitioner or professional nutritionist, because Imperatae Rhizoma (Mao Gen) has a diuretic effect that may influence the body’s fluid metabolism balance, and caution is especially needed in early pregnancy. Individuals with a deficiency-cold constitution, who are prone to cold hands and feet and aversion to cold, should not use this soup as a daily health tonic. In addition, those currently taking warming and supplementing Chinese herbs (e.g., Ren Shen [Panax Ginseng], Huang Qi [Astragali Radix], Lu Rong [Cervi Cornu Pantotrichum]), or those suffering from chronic deficiency-cold conditions, should avoid simultaneous consumption or consult a physician to prevent medicinal conflict. This soup is contraindicated for individuals allergic to Imperatae Rhizoma or pork.

Ingredient Formula Proportions

Below is the standard formula and ratio for Maogen Lean Pork Soup. Precise gram measurements are recommended to ensure consistent therapeutic efficacy: – Fresh *Imperatae Rhizoma* (White Maogen) 80–100 g (if using dried rhizome, reduce to 30–40 g) – Lean pork 200–250 g – Honey jujubes 2–3 pieces (approx. 20 g) – Fresh ginger 3 slices (approx. 10 g) – Salt to taste (approx. 2–3 g, added at the end for seasoning) For optimal quality, choose fresh *Imperatae Rhizoma* that is thick, white, and sweet in taste. The lean pork should be tenderloin or pork butt (shoulder), low in fat and fine in texture; blanch it first to reduce any unpleasant smell.

If the goal is to enhance heat-clearing and diuretic effects, add 30 grams of fresh Phragmitis rhizoma (reed rhizome) or 15 grams of Stigmatis maydis (corn silk) while boiling. If accompanied by sore throat, incorporate one-quarter of a Siraitiae fructus (monk fruit). For adjunctive management of skin eczema, it is recommended to combine 20 grams of Coicis semen (coix seed) and 15 grams of Vignae semen (adzuki bean). It should be noted that all Chinese medicinal materials and food ingredients must be soaked in clean water for 10 to 15 minutes and rinsed thoroughly before cooking to remove impurities and any residual dust. When seasoning, keep it light; only table salt should be used. Do not add strong-flavored condiments such as soy sauce or monosodium glutamate, so as not to interfere with the clean, sweet essence of the medicinal meal.

Cooking Method

Step 1: Cut the pork lean meat into 2–3 cm cubes. Place them in a pot of cold water, add 1 slice of fresh ginger and a small amount of cooking wine (about 5 ml). Bring to a boil over high heat and continue boiling for 2–3 minutes. Skim off the foam, remove the meat, and rinse it with warm water. Set aside. This step effectively removes blood and any gamey odor from the meat, ensuring a clear broth and pure flavor.

Step 2: Rinse fresh Imperatae rhizoma (Imperata cylindrica) repeatedly under running water, removing root hairs and soil from the outer skin. Cut into small sections 3–4 cm long. For dried Imperatae rhizoma, soak in clean water for 20 minutes until softened, then rinse twice. Clean honey-dried jujubes (Ziziphus jujuba) with warm water to remove surface dust. Slice fresh ginger (Zingiber officinale) and set aside. Place the prepared Imperatae rhizoma, honey-dried jujubes, and the remaining 2 slices of ginger into a soup pot. Add sufficient clean water, approximately 1500–1800 ml.

Step 3: Place the blanched lean meat into a soup pot, cover with the lid, and bring to a boil over high heat. Immediately reduce the heat to low (maintaining a gentle simmer with tiny bubbles on the surface) and slowly cook for 1.5 to 2 hours. During this time, open the lid as little as possible to preserve the medicinal constituents and aroma. Ten minutes before turning off the heat, add an appropriate amount of salt to season, stir well, and continue simmering until the time is up. After turning off the heat, let it rest for 5 minutes until the soup temperature drops to 50–60°C, then use a fine-mesh skimmer to remove any floating oil from the surface. The soup is now ready to be ladled into bowls and served. The lean meat from the dregs can be removed and dipped in a small amount of light soy sauce for eating, while the Imperatae Rhizoma (white imperata root) and honey dates (Ziziphus jujuba) should be discarded.

Drinking Tips

Tip 1: The best time to drink is between 9:00 and 11:00 a.m. (when the Spleen Meridian is in command) or between 3:00 and 5:00 p.m. (when the Bladder Meridian is in command). During these two periods, the body’s digestive, absorptive, metabolic, and excretory functions are relatively active. Drinking Imperata and Lean Pork Soup at these times can maximize its regulatory effect of clearing heat and promoting diuresis. It is recommended to consume it warm on an empty stomach or semi-empty stomach, 200–300 ml per serving, 2–3 times per week, for no more than two consecutive weeks. If continued use is desired, a one-week interval should be observed.

**Tip 2:** This soup should be freshly prepared and consumed on the same day; do not store it overnight. If you make a larger batch, you may remove the unseasoned soup, allow it to cool, then divide and refrigerate. However, refrigeration should not exceed 24 hours, and the soup must be brought to a full boil again before drinking. Note: Repeated reheating will destroy some of the active components and reduce both the therapeutic effect and the taste. When consuming, avoid eating cold and raw foods (such as ice cream, watermelon, or iced drinks) to prevent cold-dampness pathogens from damaging the Spleen-Stomach yang qi.

**Tip 3:** When preparing homemade *Imperata Rhizome and Lean Meat Soup* (Mao Gen Tang), the quality can be assessed by observing the soup’s color and taste: a high-quality soup has a pale yellow or light golden hue, is clear and bright, tastes refreshingly cool and slightly sweet on the palate, and lacks any bitter, astringent, or meaty unpleasantness. If the soup appears dark, tastes sour or astringent, or is cloudy, it may be due to stale Imperata rhizome, excessive cooking time, or overly high heat. Additionally, for children, the elderly, or those with weak digestive function, it is recommended to simmer the lean meat until very tender and to skim off any surface fat to reduce the digestive burden.