Marinate chicken with fish sauce and sugar. Refrigerate.
Heat 2 tbsp oil with 1/8 cup sugar on medium high heat in non-stick pan or medium heat for stainless steel pan. Once sugar starts to turn dark brown at edges (about 4 minutes), give it a quick stir and add shallots. Cook shallots for 2 minutes or until softened and has absorbed color.
Add ginger and cook for another 2 minutes until slightly softened.
Add chicken and 1/4 cup fish sauce. Cook off for about 15 minutes until liquid has evaporated.