Prepare the banana leaf by cutting along the midvein of the leaf and discarding it. Cut the leaf into equal rectangular pieces. Wilt or quail banana leaves by passing them over an open flame, or bring a large pot of water to boil and dip the leaves in the boiling water until they are wilted. You can use a pair of tongs to remove them, and then set aside.
In a large bowl, add cornmeal, flour, sugar or sweetener of choice, cinnamon, nutmeg, and salt, and mix until fully combined. Set aside.
Add coconut milk, green banana, sweet potato, and vanilla to a high-speed blender, or grate green banana and sweet potato using a box grater. Process until the mixture resembles a coarse batter.
Stir the mixture into the dry ingredients and mix until combined, then fold in the grated coconut and raisins.
Place about 2-3 tablespoons of the batter onto the center of the banana leaf, then bring the edges of the banana leaf over the batter.
Fold the edges under to make a tight package, then tie the blue draws with strips of banana bark or baker's twine securely. Repeat until all the batter is gone.
Bring a large pot of water to boil over medium-high heat. Add blue draws parcels. Return to a boil, then reduce to simmer for one hour.
Remove each of the blue draws from the pot using a pair of tongs, and place into a serving plate. Remove the tie from each parcel and serve.