In a blender, combine all the marinade ingredients until a smooth paste is formed. If the mixture is too thick, add a little water.
Thoroughly mix the meat with the marinade and refrigerate for 4 hours, ideally overnight. In a separate bowl, mix the vegetables with the rest of the marinade.
Preheat the oven to 180°C (350°F). Place pieces of banana leaf or a large sheet of aluminum foil on a baking tray. Place the meat, potatoes, sweet potatoes, and corn in the center and wrap them into a package.
Bake the packages in the oven for about 90 minutes. The longer cooking time will ensure the meat is incredibly tender and falls off the bone.