Curry is one of the easiest dish to prepare but first you need to get the ingredients right. Asian Curry should not be sweet, normally no sugar is added to the dish, it should have a distinct curry flavour with a touch of little sourness. Another item should not add is carrot, it will make the curry sweet and flavour the curry with carrot taste, carrot is good for stew.
In South East Asia there are many version of curries, Chinese, Nonya, Malay, Indian or Thai. To me Japanese Curry is not curry, it is just a stew cook in curry powder. An authentic curry should have a layer of oil which is the curry powder oil. Here is my version I have integrated from my mother's Nonya Curry and my ex-wife's Malay Curry, but the basic cooking style remains the same.