Hawaijar: The Alkaline Fermented Soybean Probiotic of Manipur

Hawaijar is a traditional alkaline fermented soybean food originating from the Meitei community of Manipur, a hilly state in Northeast India . This vegan, non salted product is known for its sticky, mucilaginous texture, light grey to tan yellow color, and a slightly pungent, ammoniacal aroma . Unlike the sticky, pullable strands of kinema, Hawaijar has a supple but not overly soft texture. It serves as an affordable, high protein condiment and is an intricate part of the Manipuri diet, often mixed with king chili (umorok), onion, and salt as a side dish with steamed rice .

Cultural Roots, Local Names, and Regional Variations

Cultural Origins and People

Hawaijar is deeply embedded in the culture of the Meitei people, the predominant ethnic group in the Manipur valley. Traditionally, the knowledge of preparing Hawaijar is passed down through generations, with women in Meitei Brahmin families typically producing it at a domestic level . Every locality historically had one or two producers who sold the product within their surrounding area. Routine production and sale of Hawaijar provides a vital source of additional income for rural women, supporting the socioeconomic status of many households .

Local Name and Regional Context

The product is uniformly known as Hawaijar within Manipur. It is one of several essential fermented items in Meitei cuisine, alongside fermented bamboo shoot (soibum), fermented fish (ngari and hentak), and local alcohol (yungou) . The Meitei Pangal community, the Muslim population of Manipur, also practices the fermentation of Hawaijar as part of their traditional food processing methods .

Comparison with Global Fermented Soybeans

Hawaijar shares many properties with other alkaline fermented soybean foods across Asia. It is considered the Indian counterpart to natto of Japan, douchi of China, thua nao of Thailand, and choongkook jang of Korea . All these products rely on Bacillus species for fermentation but differ subtly in texture, flavor, and local preparation techniques.

Culinary Usage

Beyond being a simple side dish, Hawaijar is a key ingredient in the prized Manipuri delicacy called chagempomba. This dish is a pudding made by cooking Hawaijar with rice grains, green vegetables such as mustard leaves or pea shoots, tree beans (yongchak), and sometimes fish . Hawaijar is also used as a fish substitute in traditional dishes when fish or meat is not permitted due to religious or other reasons .

Microbiology and Probiotic Profile

Dominant Microbial Communities

The fermentation of Hawaijar is driven primarily by Bacillus species, similar to other alkaline fermented soybeans. Advanced culture dependent and independent techniques have revealed a complex bacterial ecosystem:

Dominant Genera (Present in high abundance)

· Bacillus: The primary functional microorganism responsible for proteolysis and the sticky texture

· Ignatzschinaria: A common associated genus in the fermented soybean ecosystem

· Corynebacterium: Present as part of the core microbiota

Exclusive Genera (Unique to Hawaijar compared to other regional ferments)

· Brevibacillus: Found exclusively in Hawaijar, not present in similar products like Bekang or Akhone

· Staphylococcus: Also unique to Hawaijar among the three compared fermented soybean varieties

Specific Bacillus Species Identified

Research has identified a consortium of Bacillus species working in concert:

· Bacillus subtilis: Ubiquitous and dominant across all samples

· Bacillus amyloliquefaciens: Contributes to enzymatic breakdown

· Bacillus tropicus: Forms part of specific bacterial clusters

· Bacillus megaterium: Present in the microbial consortium

· Bacillus borstelensis: Identified as a component species

· Bacillus thermoamylovorans: Found in specific bacterial clusters

· Bacillus rugosus: Part of the bacterial diversity

Metabolite Uniqueness

A comparative study revealed that Hawaijar possesses a distinct metabolite profile. It shows a higher abundance of essential amino acids, amino and nucleotide sugars, and vitamins compared to other fermented soybean foods of Northeast India like Bekang and Akhone .

Probiotic Load and Peak Activity Stage

Total Bacillus count

Traditional Hawaijar contains Bacillus species in the range of 10⁷ to 10⁸ CFU per gram

Peak Probiotic Diversity and Count Stage

The peak of probiotic diversity and microbial count occurs at the conclusion of the fermentation period, typically after 48 to 72 hours when the temperature inside the wrapped package remains warm and stable. At this stage:

· Bacillus populations reach their maximum concentration, typically between 10⁷ and 10⁸ CFU per gram

· The full consortium of Bacillus species including B. subtilis, B. amyloliquefaciens, and other identified species is fully established

· The sticky, mucilaginous texture is fully developed due to poly gamma glutamic acid production

· The product exhibits its characteristic light grey to tan yellow color and slight ammoniacal pungency

This stage represents the optimal consumption window for maximum probiotic benefit. Beyond this point, counts gradually decline during storage.

Food Safety Considerations

Unlike the more stringent production environments for commercial natto, the traditional production of Hawaijar raises significant food safety concerns. Studies have detected a substantial population of potential pathogens, including Bacillus cereus and Proteus mirabilis, at levels reaching 10⁷ to 10¹⁰ CFU per gram . More concerning is the detection of enterotoxic and urease genes in microorganisms isolated from traditionally produced Hawaijar . These findings highlight the critical need for improved starter culture development and regulated production methods to ensure safety while preserving probiotic benefits.

Preparation Guidelines

Raw Materials

Soybeans

Quantity: 500 grams, whole dried soybeans, preferably small seeded variety

Water

Quantity: Sufficient for soaking and boiling

Traditional Wrapping Material

Fresh banana leaves or specific local leaves such as Ficus hookeriana, alternatively muslin cloth or large teak leaves

Traditional Preparation Process

Step 1: Soybean selection and soaking

Select whole, unbroken small seeded soybeans. Wash thoroughly in clean water. Soak in clean water for 8 to 12 hours or overnight until beans double in size and the seed coats loosen easily.

Step 2: Dehulling

Rub the soaked beans between palms or against a rough surface to remove the seed coats. Winnow or wash away the floating hulls. Complete dehulling is traditional for Hawaijar, distinguishing it from some other fermented soybean products.

Step 3: Boiling

Boil the dehulled soybeans in plenty of water until they become soft enough to be mashed easily between two fingers. This typically requires 2 to 3 hours of cooking. Drain all excess water completely.

Step 4: Light pounding or splitting

Traditionally, the boiled beans are lightly pounded or pressed to split them. This increases the surface area available for microbial action and results in the characteristic supple, not overly soft texture of Hawaijar.

Step 5: Wrapping and fermentation

Wrap the boiled and split soybeans in fresh banana leaves or in a clean muslin cloth. Secure the package tightly. Place the wrapped package in a warm location, traditionally near the cooking hearth or in a basket lined with cloth or straw. Ferment for 48 to 72 hours. The optimal fermentation temperature is approximately 40 degrees Celsius, similar to kinema.

Step 6: Checking doneness

Properly fermented Hawaijar develops a sticky, mucilaginous surface with a slimy feel. The color changes from the yellow of boiled beans to a light grey or tan yellow. A pungent, slightly ammoniacal aroma indicates successful fermentation. The beans should be bound together by sticky strands when pulled apart, though the texture is described as supple rather than extremely sticky.

Step 7: Storage

Fresh Hawaijar is consumed immediately or stored for a few days. Without refrigeration, it lasts 2 to 3 days. For longer storage, sun drying produces a shelf stable product that can be kept for several months. Refrigeration of fresh Hawaijar slows further fermentation and extends usability to one to two weeks.

Medicinal and Nutraceutical Benefits

Hawaijar offers a range of scientifically documented health benefits derived from both its microbial content and the bioactive metabolites generated during fermentation. The fermentation process effectively removes or reduces antinutritional factors present in raw soybeans, including trypsin inhibitors, phytic acid, and certain oligosaccharides .

Digestive Enhancement and Nutritional Profile

Fermentation significantly enhances the nutritional quality of soybeans. Crude protein content increases while carbohydrate content decreases, making the product more digestible. The process breaks down complex proteins into bioavailable amino acids and peptides. Unlike unfermented soybeans which can cause bloating and flatulence, properly fermented Hawaijar is easily digestible .

Fibrinolytic and Thrombolytic Activity

One of the most significant health benefits of Hawaijar is its potential cardiovascular protective effect. Fermented soybean products, including Hawaijar, have demonstrated fibrinolytic activity, meaning they possess the ability to break down fibrin, the protein involved in blood clot formation. This thrombolytic activity may help prevent or dissolve pathological blood clots in the circulatory system, reducing the risk of cardiovascular diseases .

Antidiabetic Potential

Research has revealed promising antidiabetic properties of Hawaijar. A 24 kDa protein isolated from Hawaijar protein extracts demonstrated significant antidiabetic potential by stimulating the PI3K/AKT/GLUT4 signaling pathway, which is involved in glucose uptake into cells . This suggests a mechanism by which Hawaijar consumption may help regulate blood glucose levels.

Bioactive Metabolites and Postbiotics

Essential amino acids

Hawaijar contains a higher abundance of essential amino acids compared to similar fermented soybean products, contributing to its high quality protein profile

Vitamins

The product shows elevated levels of various vitamins, with metabolite profiling confirming higher vitamin content relative to other regional fermented soybeans

Amino and nucleotide sugars

These compounds are present in greater abundance in Hawaijar and contribute to its prebiotic potential

Antioxidant activity

The fermentation process generates bioactive peptides with antioxidant properties, protecting cells from oxidative damage

ACE inhibitory activity

Angiotensin converting enzyme (ACE) inhibitory peptides have been identified in Hawaijar, suggesting potential mild antihypertensive effects through blood pressure regulation

Immunomodulatory effects

The bioactive compounds generated during fermentation help modulate immune function, contributing to overall health maintenance

Comparison with Commercial Products

The scientific documentation of Hawaijar reveals both advantages and challenges. While it possesses significant potential as a functional food and nutraceutical product for the global market, traditional production methods present food safety issues that require attention . The development of starter cultures using GRAS (generally regarded as safe) Bacillus isolates from hygienic production could yield a safe, standardized product that retains all the health benefits. This holds potential to provide employment and enhance the overall socioeconomic status of the region .

Usage Note

Hawaijar has a strong, acquired taste profile with a distinct ammoniacal note. First time consumers should begin with small quantities mixed into soups or rice dishes. Due to potential pathogen presence in traditionally produced Hawaijar, individuals with compromised immune systems should exercise caution. Those with soy allergies should avoid the product entirely. Pregnant women and young children may prefer to consume Hawaijar that has been cooked rather than raw.

Enjoy Hawaijar as a protein rich side dish mixed with steamed rice and chili, as a flavoring agent in vegetable stews, or as the defining ingredient in the traditional Manipuri delicacy chagempomba.

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