Combine all the ingredients in a bowl and mix together. Break up the brown sugar real well and remove hard clumps.
Fill aluminum cups 2/3 full with the batter.
Put the aluminium cups into a frying pan and add some water. Cover with a lid and steam over high heat for 5 minutes. Then, turn the heat to medium and continue steaming for 5-10 minutes.
When a skewer or toothpick inserted in the cake comes out clean, it is done.
Story Behind this Recipe
This is a sweet I have made with my friends for a long time. It's nutritious, so give them to friends.
Add enough water to reach about 1/3 of the height of the aluminium cups. If the water in the frying pan evaporates, add a little hot water to the pan. Depending on the amount of cups, adjust the steaming time.