People order kangkung belacan thinking they are being healthy because it is a vegetable. And the kangkung itself is basically free, maybe 30 calories for the whole plate. But watch how they cook it. That kangkung goes into a wok with a generous glug of oil to fry the belacan and garlic, and it soaks a lot of it up. That is how a plate of greens ends up at 190 calories with 14g of fat.
Do not get me wrong, this is still a good order. You are getting actual vegetables and fibre, which most hawker meals are missing. Just know it is not the zero calorie health halo people assume. It is a vegetable cooked in oil, and the oil counts.