Steam the compacted glutinous rice for 10 mins, then scoop 180 g of custard mixture over the rice and steam for 10-15 mins or till layer is firm and pour in subsequent 180 g custard mixture and steam until firm.
Repeat the processs, there should be about 5 layers.
This recipe does not allow single layer top custard as the recipe is meant to be done layer by layer, understand this is original nonya style.
Single layer recipe is different.
Last layer can steam a little longer about 15 to 20 minutes.
Once done set it aside to cool down at least 4 hours to let it set before invert it to bring out the kueh.
I would use a spatula to dig the sides to loosen it and place a flat cutting board over it and invert the tray to let it drop of the tray and they place another tray to invert in on and you are ready to cut.
Cutting kueh need plastic knife, metal knife seems to not able to cut as the rice will stick to metal knife.
That's it, happy steaming the kueh salat .