I recalled that I made this dish in 2007. I think Little Corner of Mine and Tigerfish remember this recipe as well.
It is an adaptation recipe of Sambal Serai Kepah (English: Clams Lemongrass Sambal) which I saw on Indonesian women magazine “Kartini” through bacamajalah.com.
In that article, it was saying that the food is served twice a year every Eid-ul Fitr and Eid-ul Adha on tradition “Menjunjung Duli” in the Sultanante of Deli, Medan, North Sumatra. At those days, Maimun Palace or Maimoon Palace is opened for public to say Happy Eid to Sultan of Deli and the families. The current Sultan of Deli is Tuanku Sultan Mahmud.
So, this dish is a part of Malay “Melayu” culinary of Kesultanan Deli in Medan, North Sumatra.