In a large bowl, combine the mashed taro or yam with the grated coconut, coconut milk, brown sugar, salt, and ground nutmeg (if using). Mix well until the mixture is smooth and well combined.
If using banana leaves, clean them thoroughly and soften them by briefly passing them over a flame or steaming them. If using parchment paper, cut it into large squares.
Place a small portion of the taro mixture in the center of each banana leaf or parchment paper square.
Fold the leaf or paper around the mixture to form a parcel. Secure with kitchen twine or toothpicks if necessary.
Steam the parcels in a steamer basket over boiling water for about 30-40 minutes, or until the mixture is firm and cooked through.
Remove the parcels from the steamer and let them cool slightly before unwrapping.
Enjoy your meal!