For the bottom layer
Soak glutinous flour overnight ( or at least 3 hrs). Then put in tray or pan (17 inch) and add the 200ml coconut milk. Tie the screwpine leaves in knots and put on top of the rice. Steam for 30 minutes till rice is cooked.
Meanwhile blend the screwpine leaves, add the santan and santan powder. Add the rest of the ingredients and stir till smooth.
Press the cooked rice down evenly. Scarth the top of rice with fork.
Sieve the contents and pour on top of the rice. Steam for another 12 to 15 mins.