Mao Gen Pig Lung Soup: Traditional Chinese Soup for Respiratory Wellness

Introduction to a Traditional Herbal Soup

Mao Gen Pig Lung Soup is a classic traditional soup originating from the Lingnan region. It is made by slow-cooking fresh Imperatae Rhizoma (Mao Gen, cogongrass rhizome) and pig lung as the main ingredients, supplemented with honey dates, Citri Reticulatae Pericarpium (Chen Pi, tangerine peel) and other seasonings. Imperatae Rhizoma is the rhizome of *Imperata cylindrica* (Poaceae) and has long been used in Traditional Chinese Medicine as a herb to support fluid balance. Pig lung is traditionally considered a nourishing ingredient, especially suitable for individuals seeking respiratory comfort.

This soup has a clear broth, a sweet taste, and a delicate fragrance. It serves both as a nourishing daily family soup and as a supportive choice during seasons of spring dampness and autumn dryness. The combination of Imperatae Rhizoma (Mao Gen, Cogongrass Rhizome) and pig lung skillfully merges the herb’s cooling properties with the food’s nourishing effect, embodying the core TCM principle of “medicinal and culinary homology” (medicine and food share the same origin).

In Guangdong, Guangxi, and other regions, during seasonal transitions, many families prepare this soup to support respiratory wellness. Its enduring popularity has made it a widely circulated folk wisdom for health preservation.

Traditional Benefits

Supports respiratory comfort and clear feeling in the chest.

Mao-Gen-Pig-Lung Soup (Bai Mao Gen Zhu Fei Tang) is most notable for its ability to help maintain respiratory ease and soothe occasional discomfort. Bai Mao Gen (Imperatae Rhizoma, Common White Rush) is traditionally associated with supporting the body’s natural cooling processes. Zhu Fei (Pig Lung) is used to help nourish and moisten the respiratory system. When used together, they provide a favorable effect for those seeking respiratory comfort, especially during dry seasons. Modern nutritional research has found that pig lung is rich in collagen and various amino acids, which may help support respiratory tract health.

Helps maintain healthy fluid balance and normal circulation.

The active components such as coixol and imperanene found in *Imperatae rhizoma* (Bai Mao Gen) have significant diuretic properties, helping the body maintain healthy fluid elimination. This is particularly supportive for individuals experiencing occasional water retention due to lifestyle factors. Additionally, *Imperatae rhizoma* is traditionally used to help maintain normal blood flow and support overall vascular wellness.

Traditional Chinese Medicine Perspective

From the perspective of Traditional Chinese Medicine theory, Imperata Rhizome and Pig Lung Soup (Mao Gen Zhu Fei Tang) is traditionally associated with supporting the Lung (LU), Stomach (ST), and Bladder (BL) meridians. Imperata Rhizome (Bai Mao Gen, *Imperata cylindrica*) is sweet in flavor and cool in nature. It is traditionally used to help maintain lung comfort, promote fluid production, and support healthy urinary function. Pig lung is sweet in flavor and neutral in nature. It is used to help nourish lung tissues and maintain respiratory moisture. The two complement each other: one provides cooling support, the other provides nourishment, helping to maintain balanced lung function.

TCM posits that the “lung is a delicate organ, preferring moisture and disliking dryness.” When exposed to environmental dryness or heat, the lungs may feel uncomfortable. The Soup of Imperatae Rhizoma and Pig Lung (Maogen Zhufei Tang) utilizes the cooling and fluid-supporting action of Imperatae Rhizoma (cogongrass rhizome) to help guide warmth out of the body, while the moistening and tonic properties of pig lung help maintain healthy lung tissues. This achieves the traditional goal of “expelling factors without harming the body’s vital energy.” This medicinal food is particularly suited for those looking to maintain respiratory wellness in dry or warm conditions.

Who May Benefit

Imperatae Rhizome and Pig Lung Soup is particularly suitable for individuals who experience occasional throat dryness, hoarseness, or respiratory discomfort, especially those who smoke long-term, work in dusty environments, or are teachers and others who frequently use their voice. For those seeking support during seasonal changes, consuming this soup may provide comfort.

Furthermore, for individuals with occasional respiratory sensitivity or those recovering from temporary respiratory strain, consuming an appropriate amount of Mao Gen Zhu Fei Tang (Imperatae Rhizoma [Lalang Grass Rhizome] and Pig Lung Soup) during the stable phase may help maintain respiratory comfort and support overall wellness. For those who tend to feel warm internally in spring, this soup may help maintain a sense of balance. It is also suitable for individuals seeking support for normal urinary function and mild water retention.

Precautions

People with a tendency toward digestive coldness and loose stools should avoid consuming Imperata Root and Pig Lung Soup, as Imperata Root (Bái Máo Gēn) is cool in nature and may affect digestive comfort, potentially aggravating loose stools or abdominal discomfort. If such individuals still need to consume it, 3 to 5 slices of fresh ginger (Shēng Jiāng) may be added to the soup to balance the cool nature, though cautious use is recommended.

Pregnant and breastfeeding women should use *Imperata cylindrica* (cogongrass rhizome) with caution, as its diuretic effect may influence electrolyte balance in the body. It is also not suitable for elderly and children with a very weak constitution and cold pattern, as well as individuals allergic to pig lung. Additionally, those taking warming herbal supplements or medications should consume it under professional guidance to avoid potential interactions.

Ingredient Formula Ratio

The following is the standard formula and proportions for Mao Gen Zhu Fei Tang (Cogongrass and Pork Lung Soup, serves 4–5 people): Fresh Imperata cylindrica (cogongrass root) 150 g (if fresh is unavailable, substitute with 50 g dried Imperata cylindrica); pork lung 1 piece (approx. 500–600 g); honeyed Fructus Jujubae (honey dates) 3 pieces (approx. 30 g); Citri Reticulatae Pericarpium (tangerine peel) 1 small segment (approx. 3 g); Zingiber officinale (fresh ginger) 2 slices (approx. 6 g); table salt, to taste (approx. 3 g, added at the end for seasoning).

Fresh, thick, and white Imperatae Rhizoma (cogongrass rhizome) is preferred; for pig lung, choose a healthy one with a light pink color and no bruising or damage. Honey dates and Citri Reticulatae Pericarpium (tangerine peel) not only enhance the soup’s sweet flavor but also help remove any strong taste from the pig lung. Additionally, tangerine peel is traditionally used to support digestive comfort, which can balance the cool nature of cogongrass rhizome. The proportions of all ingredients can be slightly adjusted according to individual constitution and taste, but the amount of cogongrass rhizome should not be excessive.

Cooking Method

Step 1: Prepare the pig lung. Attach the trachea of the pig lung to a faucet and repeatedly flush it with water until the lung expands, turns pale, and all blood is completely rinsed out. Then, cut the pig lung into cubes of about 3 cm, blanch them in boiling water for 3 to 5 minutes. Remove and rinse thoroughly with cold water, then set aside. This step is crucial for effectively removing impurities from the pig lung.

Step 2: Prepare the herbs. Fresh Imperata cylindrica (Cogongrass rhizome) is washed and cut into approximately 4 cm long sections. Dried Imperata cylindrica is soaked in clean water for 20 minutes in advance. Dried red dates (Ziziphus jujuba) are washed and pitted. Tangerine peel (Citri Reticulatae Pericarpium) is softened in warm water, then the inner white pith is scraped off. Fresh ginger (Zingiber officinale) is washed and sliced.

Step 3: Simmer the soup. Place the prepared pig lung pieces, Imperatae Rhizoma (cogongrass rhizome), honeyed jujubes, Citri Reticulatae Pericarpium (tangerine peel), and fresh ginger slices into a clay pot or soup pot. Add sufficient water (approximately 2500 to 3000 ml). Bring to a boil over high heat, skim off any foam, then reduce to low heat and simmer for 1.5 to 2 hours. During simmering, avoid lifting the lid frequently to prevent loss of aroma.

Step 4: Season and finish cooking. Once the pig’s lung is tender and the soup turns a light yellow color, add an appropriate amount of table salt to season. Note: Add the salt only at the very end, just before turning off the heat. Adding salt too early will cause the lung meat to become tough. After turning off the heat, let the soup rest covered for another 5 to 10 minutes to allow the flavors to meld further. When serving the soup, you may remove the pig’s lung and dip it in a small amount of soy sauce for a distinctive flavor.

Tips for Consumption

1. Imperatae Rhizoma (Bai Mao Gen) and Pig Lung Soup should be consumed warm 1 to 2 hours after meals, with each serving of 150 to 200 ml. A continuous intake of 3 to 5 days is recommended as a typical course. It is not recommended to take on an empty stomach, as the cool nature of Imperatae Rhizoma (Bai Mao Gen) may affect digestive comfort.

2. This soup has a cool nature, and the best seasons for consumption are spring and autumn, especially during periods when seasonal dryness or warmth is common. It can be consumed in moderation in summer, but those with a generally cool body type in winter should reduce the frequency of consumption or combine it with warming ingredients such as ginger (Zingiber officinale) and red dates (Ziziphus jujuba).

3. The leftover soup can be stored in the refrigerator for 1 to 2 days, and should be brought to a full boil before consuming again. However, note that pork lung should not be reheated repeatedly; it is best consumed within 24 hours. If the soup develops an off smell or becomes cloudy, it should be discarded immediately and not consumed.