This is a traditional Indonesian cake with a similar texture to a crumpet but richer and sweet.Like many Indoonesian cakes this one is very rich so serve only a small slice. Although you can use canned coconut milk you will need a coconut for the coconut water. Don't use too old a coconut or the water will be bitter. You can sometimes buy coconut juice at Asian grocer's but this is often sweetened, so you may need to reduce the sugar by about 100g. In hot weather this cake should be stored in the fridge as it will sour. Bring to room temp before eating.