Banh Da Lon is a Vietnamese steamed layered cake that is infused with pandan leaves, coconut milk, and mung beans! It is soft, chewy, and so addicting!
Cook the beans: Drain the mung beans and transfer them to a small saucepan. Add the water and bring to a simmer over low-medium heat. Let simmer for 10-15 minutes, covered, until the beans are completely soft. Note: feel free to add a bit more water if no water remains and the beans are still firm.
Combine: Drain and transfer the cooked beans to a high-speed blender. Add the coconut milk, water, sugar, tapioca starch, rice flour, and vanilla extract. Blend for 10-15 seconds or until smooth. Transfer the batter to a bowl and set aside.
Green Layer
Prepare the pandan juice: Roughly chop the pandan leaves and add them to a blender. Add the water and blend on high-speed for about 30 seconds.
Strain the juice using a fine-mesh sieve and discard the pulp, only keeping the liquid. Note: the juice will smell very grassy. It is normal, the flavor will change after cooking.Transfer the juice to a large mixing bowl.
Combine: To the mixing bowl, add the coconut milk, sugar, tapioca starch, rice flour, and pandan extract if using. Whisk until fully combined. Set aside.
Steam
Prepare your setup: Fill a saucepan with 2-3 cups of water and place a bamboo steamer on top. Bring the water to a boil. Lightly grease a 3x6-inch pan (you will have enough batter for two pans) with oil and place it in the steamer for 2 minutes.
Steam the first layer: Pour one layer of the green batter into the pan and steam for 3 minutes. I went with 3 tablespoons of the batter to get thin layers. Adjust depending on the size of your pan.
Steam the second layer: Pour the same amount of the yellow layer over the green layer. Steam for 4 minutes.
Repeat. Repeat the process until you have about 7 layers (you can do more). For each layer, increase the steaming time by one minute.
Finally, after steaming the last layer, let the whole cake steam for an extra 7 minutes.
Let cool: Remove the pan from the steamer and let the cake cool completely before removing it from the pan.
Slice: Using a sharp knife with the blade wrapped in plastic wrap (to prevent sticking), cut each loaf into 5 rectangles. Enjoy as a snack!
Notes
Check the water level. Since steaming will take a total of 45-55 minutes, a lot of water will evaporate. Make sure to check the water level occasionally and add more if needed.
Be careful not to burn yourself. There will be a lot of steam escaping the steamer basket when you open it to pour a new layer, so be careful when doing so.
Store at room temperature. Avoid storing Banh Da Lon in the refrigerator as it tends to dry and get harder.