Put onion, garlic, ginger, chillies, kemiri nuts and soy sauce into a blender and blend to a smooth paste. Cut chicken into pieces, heat half a cup of peanut oil in a wok and fry the chicken pieces quickly until brown. Remove chicken and drain on absorbent paper. Pour off oil leaving only 1 tablespoon, and fry the blended mixture for a few minutes, stirring constantly. Add sugar, lemon juice and coconut milk and keep stirring while mixture comes to the boil. Return chicken and simmer uncovered for 45 minutes or until gravy is thick & chicken is tender. Serve with plain white rice, fresh fruit, vegetables and other accompaniments.