Place drained beans and 500 grams of water into and cook for 6 minutes at 80 degrees on speed 1-2. Ensure that the beans are cooked at 80 degrees for at least 2 minutes.
Blend for 1 minute on speed 8 until smooth and creamy.
Add remaining water, pandan leaves and sugar and cook for 6 minutes at 90 degrees on speed 2-3. Towards the end of cooking, keep an eye on it to ensure that it doesn't boil over.
Cool, strain through a calico cloth or nut bag and serve warm or cold. This is meant to be drunk as a beverage but can also be used on cereal or as a milk substitute (in which case you may prefer to not add pandan leaves and sugar).