In a bowl, combine pineapple juice, ketchup, sugar, garlic powder, and salt, Stir until well distributed.
Add chicken and massage meat with curing mixture until evenly colored. Transfer to a covered container or ziplock bag and refrigerate for about 4 hours or overnight to cure.
In a pan over medium heat, add chicken including marinade and enough water to cover.
Bring to a boil. Lower heat, cover and simmer until meat is tender and cooked through, adding more water in ½ cup increments as needed.
When the meat is cooked through and liquid is mostly absorbed, add oil. Continue to cook, stirring regularly, until chicken is nicely browned and caramelized. Serve hot.
Video
Notes
Do not marinate longer than overnight as the acidity of the pineapple juice might denature the proteins and turn the meat mushy.