Supertasters taste a soapy taste when they eat cilantro.
Two ways to tell... count the big lumps in the back of your tongue. If there are more than 8, you're a supertaster. These are supposed to be used to taste bitter flavors.
Rip or cut out a hole from a common paper hole punch. Color the tip area of your tongue with blue food coloring. Place the hole punch in the most concentrated area of taste buds near the tip of your tongue. Count in a mirror. If you count more than 30, you're a supertaster.