Many Mistake This for a Guava — What About You?

Answer:

This is the Găng Trâu, also known as Găng Tu Hú. It is a wild, inedible fruit that grows in mountainous areas, with its fruiting season typically from April to July each year. In the past, people would collect these fruits, dry them, or crush the fresh ones and soak them in water to use as a natural detergent for washing clothes, especially silk garments, as it works exceptionally well. Additionally, Găng Trâu fruit can also be used as a natural hair wash.