Why the best flavoring agent in Southeast Asia is actually a male water bug

Food & Drink · Published 4 October 2026 Swipe more like this →

In short: In parts of Thailand and Vietnam, a single drop of liquid from a giant water bug can transform a bowl of soup. But if you are seeking that signature banana-like aroma, you must look specifically for the males.

The giant water bug, Lethocerus indicus, is a prized culinary staple across South and Southeast Asia, particularly in Manipur, India, and Thailand. Known as 'maeng da' in Thailand and 'cà cuണ്ട' in Vietnam, these aquatic insects are far more than just a novelty food. They serve as potent flavoring agents, where their essence is harvested from liquid-producing sacs to create highly sought-after condiments like the Thai chili sauce, nam phrik maeng da.

The secret to their culinary value lies in sexual dimorphism. While both sexes possess scent glands, the males are the primary target for entomophagy due to their superior aroma. Research shows that males possess 24 specific volatile compounds, including (E)-2-hexenyl acetate, which imparts a distinct, sweet banana-like scent. In contrast, females possess 37 specific compounds, but their scent profile lacks this specific fruitiness. This chemical difference is so pronounced that native populations in Northeast India specifically prefer male insects for their flavor.

Beyond aroma, the nutritional profile of the male is notably different. Analysis of fatty acids reveals that males have a higher concentration of polyunsaturated fatty acids (PUFA) at 18%, enriched with DHA and EPA, compared to just 10.04% in females. They also contain more monounsaturated fatty acids (MUFA) at 6.78%, versus 4.75% in females. Because the demand for the authentic essence is so high and the insects are considered scarce, much of the 'cà cuống' essence found on the market is actually imitation, as the real extract fetches a premium price.

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