Blend onions, garlic, lemongrass, ginger, candle nuts and water until it becomes a liquid. Heat oil in a wok or deep frypan until very hot. Add your onion blend to the pan and mix well. Then add curry powder, coriander, cumin, turmeric and 250mL of the coconut milk. Stir until well combined, then add mango juice, tomato sauce, salt and sugar. Stir again. Combine the remaining 500mL coconut milk and two cups water in a large saucepan and add curry blend. Throw in your chicken and simmer until chicken is cooked through. To serve, slice chicken into bite-sized pieces and spoon sauce over the top. Serve with rice or roti.