Combine santan with the hoen kwe flour, rice flour and water. Strain, then add sugar and salt. Cook this runny batter over a low heat. Add the sweetcorn kernels and keep stirring until it turns gluey and thickens. Take the batter away from the heat.
Take a piece of banana leaf, place one tablespoon of hot batter in the centre then add a slice of banana. Top with another tablespoon of batter. Form a bundle by folding up opposite edges of the banana leaf to meet in the centre. Secure with a staple. Leave to cool then chill well before serving.