Slice pork into thin, even pieces.
In a bowl, combine sugar, soy sauce, salt, and garlic.
Add vinegar, pineapple juice, and annatto powder.
Mix well until sugar dissolves completely.
Add pork slices and coat evenly.
Cover and refrigerate overnight for full marination.
Heat a skillet on medium flame.
Add marinated pork and a little oil.
Cook until sauce thickens and caramelizes.
Flip occasionally for even browning.
Serve hot with rice and egg.