The Answer is! Its A (calamansi)!
Here is the Philippines we usually use it as a alternative to dishes that require juices from a citrus fruit such as lemon.
But here! Its like the filipino version of adding lemon to salmon, Filipino dishes such as adobo and pancit can contain more flavor if added the calamansi.
The taste of a sour punch mixed with the strong bitterness of soysauce or to enhance the sensitivity to sea-food. Anyway its a amazing fruit to add to dishes that have ingredients that are bland.