Begin by preparing the chicken (ihanda ang manok). Rinse thoroughly and pat completely dry. Truss the chicken using kitchen twine (talian ang manok) to ensure even cooking. Let it come to room temperature.
In a Dutch oven or heavy-bottomed pot (kaldero), combine pineapple juice (katas ng pinya), soy sauce (toyo), and brown sugar (asukal na pula). Bring to a boil (100°C/212°F), stirring until sugar dissolves completely. Add pineapple tidbits, minced shallots (sibuyas tagalog), minced garlic (bawang), sliced ginger (luya), salt (asin), and whole peppercorns (paminta).
Lower heat to medium-low (82-88°C/180-190°F). Add the chicken, cover, and simmer for 20-30 minutes. If the chicken isn't fully submerged, turn it occasionally. Cook for an additional 10 minutes or until internal temperature reaches 74°C/165°F.
Remove chicken and keep warm. Strain the cooking liquid (salain ang sabaw) and discard solids. Bring sauce to a boil. Make a slurry by combining cornstarch (gawgaw) and water (tubig), then whisk into the boiling sauce. Simmer until thickened, about 2-3 minutes.
Let chicken rest for 10 minutes before cutting. Serve with the thickened sauce, steaming white rice (kanin), and traditional accompaniments like pickled papaya (atchara) or cucumber salad (ensaladang pipino).