Cut the potatoes into chunks. Par-boil them in a saucepan for 5 mins.
Cut the chicken into similar sized chunks.
Heat the oil in a large pan or wok over a medium-low heat, then add the
chicken and stir-fry for 2 mins to brown.
Add the Nyonya paste and stir fry for another couple of minutes.
Add the drained potatoes and continue to stir-fry for 3 mins.
Add the coconut milk and the water and bring to the boil.
Reduce heat, simmer uncovered for 10 mins then add the beans.
Continue simmering for 5-6 minutes until cooked, then serve.