Marinate chicken with curry powder and soy sauce.
Fry the mini potatoes in wok for about 5 minutes and set aside.
In the same wok, fry the onions, lemon grass and curry leaves for 1-2 minutes.
Add the curry paste and fry for another minute.
Add the chicken and stir to coat completely with paste.
Add 1 cup of water and bring to boil.
Add the potatoes and then coconut milk. Bring to boil and simmer for about 20 minutes over low heat.
Taste and add salt and sugar as necessary.