Summary:

- Some people perceive the taste of coriander (also known as cilantro) as soapy or unpleasant due to genetic differences. This is because they have a heightened sensitivity to certain aldehydes, which are organic compounds found in coriander.

- The soapy taste is caused by the presence of aldehydes, which are also found in soaps and lotions. People who are genetically predisposed to detecting these aldehydes more strongly tend to dislike the taste of coriander.

- Researchers have identified specific genes that are responsible for this sensitivity, and it is estimated that around 4-14% of the population has this genetic trait, making them more likely to perceive coriander as unpalatable.