The other day, when I was with Steve and Jit, I watched some villagers making a large batch of khao tom mat ( ข้าวต้มมัด ). This is basically sticky rice, bananas and black beans wrapped in banana leaves. This is then steamed though it could also be grilled. You may remember me talking about khanom thian before which is quite similar. Though that one uses sticky rice flour instead.
To make khao tom mat you first dissolve some sugar and salt in a pan of coconut milk. You then add the sticky rice and stir slowly over a low heat until the liquid has dissolved. Next you need to tear up some banana leaves into lengths of about 8 inches long. Spread some of the sticky rice mixture in the middle and then place a halved banana on top. Complete the sandwich with another layer of sticky rice and press in a few black beans. Tie up the banana leaves with a long strip of bamboo. You then place it in a steamer, like the one above, and steam for about an hour or so. The results will look like below. Delicious.