Asam pedas is a smart lauk choice bro. The gravy is built on tamarind and chilli, not coconut milk, so it skips the big fat hit that masak lemak and rendang carry. The sour kick also makes you feel like you are eating something rich when you are not. Most of the 250 calories is the fish itself, which is protein you want, plus a bit of frying oil that pools in the gravy.
Ikan pari and tenggiri are the classic cuts, pari being a touch leaner. Load up on the gravy and veg like okra and tomato and you get flavour and bulk for almost nothing. This is the kind of lauk you can eat regularly without guilt, just watch how much rice you drown in it.