If you think you know what ikan kembung or mackerel should taste like, then you should really try out the grilled Japanese version . The last time I had something as good as this, was many, many years ago in Baiyoke Bangkok ( don't take my word for it, it's different there today , gone downhill since )
The japs call it Saba, but as you know, these waters in Southeast Asia are where the best tasting ones thrive.
Couple that with skillful cooking method and walla...what you get is a fantastically creamy, tender, lightly crisp, juicy piece that can take you to heaven.