Prep the chicken: Pat the chicken thighs dry with paper towels.
Season both sides with salt and pepper. If using bone-in, skin-on thighs, this helps the skin crisp and render.
Mix the sauce: In a bowl, whisk 1/2 cup pineapple juice (drained from the can), 1/4 cup soy sauce, 2 tablespoons brown sugar, 2 tablespoons honey, 1 tablespoon rice vinegar, 2 minced garlic cloves, the grated ginger, and a pinch of chili flakes or a small squeeze of sriracha. Taste and adjust sweetness or salt.
Make a cornstarch slurry: Stir 2 teaspoons cornstarch with 2 teaspoons cold water until smooth.
Set aside. This will thicken the sauce later without lumps.
Sear the thighs: Heat 1–2 tablespoons neutral oil in a large skillet over medium-high. Add thighs skin-side down and sear until the skin is deeply golden and crisp, about 6–8 minutes.
Flip and sear the other side for 3–4 minutes. Remove to a plate. Pour off excess fat, leaving about 1 tablespoon in the pan.
Sauté aromatics: Reduce heat to medium.
Add 1 minced garlic clove (reserve if you prefer it fresher) and a few pineapple chunks. Cook 30–60 seconds until fragrant. This infuses the oil with flavor.
Build the sauce: Pour in the sauce mixture and bring to a gentle simmer.
Add most of the remaining pineapple chunks (reserve some for garnish if you like). Stir in the cornstarch slurry and cook 1–2 minutes until glossy and lightly thickened.
Finish the chicken in the sauce: Nestle the seared thighs back into the skillet, spooning sauce over the top. Lower heat to medium-low and cook 8–12 minutes, turning once, until the internal temperature hits 165°F (74°C) and the sauce reduces to a sticky glaze.
If it gets too thick, splash in a bit of chicken stock or water.
Add sesame oil and adjust: Off the heat, stir in 1 teaspoon sesame oil for depth. Taste and balance: add a squeeze of lime for brightness, more honey for sweetness, or a dash of soy for salt.
Garnish and serve: Sprinkle with sliced green onions and sesame seeds. Serve hot over rice, coconut rice, or cauliflower rice, with steamed broccoli or snap peas on the side.