Indonesian food is usually very spicy but my recipe is very mild since I created it as a family meal to eat with my young children who won’t touch anything remotely spicy!  For family food, I always cook without chillies and then we adults adjust the heat individually on the plate. For Indonesian food, we add a big dollop of sambal oelek (Indonesian chilli sauce) onto the side of the plate to spice up our adult portions while the children can eat the same meal without the heat.  Of course, if you don't have this particular issue to contend with, then the recipe would no double be improved with a chilli or two thrown into the spice paste. Adjust to your liking!