Cut the coconut in half and shred the flesh. Place the shredded coconut in a bowl.

Add the sugar to the coconut and let it sit for 30 minutes to 1 hour. Then transfer the coconut and sugar mixture to a pan. Cook over medium heat until the coconut and sugar are well combined. Dissolve the cornstarch in water, then add it to the coconut mixture to help it bind. Add the shredded ginger.

When the coconut filling becomes sticky, add the vanilla extract and mix well. Turn off the heat, then add the crushed roasted peanuts and toasted sesame seeds. Mix thoroughly. Let the filling cool, then shape into balls, about 18-20 grams each.

To make the dough:
Pour 3/4 cup water (200 ml) into a pot, then add the gai leaf powder and a pinch of salt. Cook and stir until the mixture thickens. Let it cool for about 5-7 minutes. Mix the sugar (80 grams) with the glutinous rice flour. Gradually add the gai leaf mixture to the flour and mix well. If the dough is too dry, add a little more water.
Knead the dough until smooth and elastic, then let it rest for 30-40 minutes to rise. Shape the dough into balls, about 35-37 grams each.

Prepare the banana leaves by folding both sides. Wash and cut the banana leaves into squares. Fold them diagonally to form a triangle, then fold again to make another triangle. Flip the corner over to finish the shape.

To assemble the cakes:
- Flatten a dough ball, place a coconut filling ball in the center, and wrap the dough around the filling. Roll the ball in a bowl of oil to prevent sticking after steaming. Place the dough ball in the center of the prepared banana leaf and wrap it up.

The cake should have a pointed, tall shape and look beautiful.
To steam the cakes:
- Bring a pot of water to a boil, then add the cakes and steam for about 25-35 minutes. Once cooked, remove the cakes and arrange them on a plate. You can store the cakes in the refrigerator once they have cooled to keep them fresh longer. When ready to eat, simply re-steam to warm them up.

And that's it—you've made these cute and delicious Bánh Ít Lá Gai! Enjoy them with your family and friends.