Ingredients
Method
Cook the Mung Bean Filling
- Rinse the split mung beans, then soak in hot water for 30 minutes. Drain well.
- Steam the beans in a steamer basket over boiling water for 25 minutes, until soft enough to mash with a fork.
- Mash the hot beans smooth, then move to a 26 cm / 10-inch nonstick skillet with the sugar, shredded coconut, oil, vanilla, and salt. Cook over low heat for 6 to 8 minutes, stirring constantly, until the mixture pulls into one mass that holds its shape on the spoon.
- Let the filling cool to room temperature, then roll into 16 balls, about 20 g each. Cover and set aside.
Make the Gai Leaf Dough
- Rinse the dried lá gai leaves and soak in warm water for 30 minutes to soften. Drain, then boil in fresh water for 25 minutes, until fully tender and dark.
- Drain the leaves and squeeze out as much water as you can. Blend or pound into a smooth, fibrous paste.
- In a large bowl, combine the lá gai paste, glutinous rice flour, sugar, oil, and salt. Knead by hand, adding water a tablespoon at a time, until the dough turns smooth, dark, and elastic and no longer sticks to your fingers, about 8 to 10 minutes.
- Cover the dough and rest for 15 minutes.
Shape and Wrap
- Divide the dough into 16 pieces, about 40 g each, and roll into balls. Flatten each into a disk about 7 cm / 2.5-inch wide.
- Set a mung bean ball in the center of each disk. Gather the dough up around the filling, pinch to seal, then roll gently back into a smooth ball.
- Brush a banana leaf square lightly with oil. Place a dough ball in the center and fold the leaf around it into a tight parcel, tucking the ends underneath.
Steam and Serve
- Arrange the wrapped cakes seam side down in a steamer basket, without letting them touch each other. Steam over boiling water for 35 minutes, until the dough feels firm and glossy through the leaf.
- Lift out of the steamer and cool for at least 15 minutes before unwrapping. Serve at room temperature.
Notes
- Use peeled split mung beans, not whole beans with skins, for a smooth filling.
- Dried lá gai leaves need soaking and boiling before they'll blend into paste.
- Sixteen cakes come from 40 g dough portions and 20 g filling balls.
- Banana leaf must be pliable, not brittle, or it cracks when folded.
