Prep the pineapple bowls: Slice the pineapple in half lengthwise, keeping the leaves attached.
With a knife, outline a rectangle around the core, then scoop out the flesh with a spoon. Dice about 1.5 cups of the fruit for the recipe and reserve any extra for snacking. Pat the pineapple shells dry.
Cook the rice: If you haven’t already, cook your rice according to package directions.
Fluff and keep warm.
Whisk the teriyaki sauce: In a small bowl, mix soy sauce, water, brown sugar, honey, rice vinegar, and sesame oil. In a separate cup, stir together cornstarch and water to make a slurry. Set both aside.
Sear the chicken: Heat 1 tablespoon oil in a large skillet over medium-high.
Season chicken lightly with salt and pepper. Cook in batches if needed, 5–7 minutes total, until browned and cooked through. Transfer to a plate.
Sauté aromatics and peppers: Add the remaining oil.
Cook garlic, ginger, and the white parts of the green onions for 30 seconds. Add bell peppers and a pinch of salt. Stir-fry 3–4 minutes until crisp-tender.
Combine and sauce: Return chicken to the pan.
Pour in the teriyaki mixture and bring to a simmer. Stir in the cornstarch slurry and cook 1–2 minutes until the sauce thickens and coats the chicken.
Add pineapple: Fold in the diced pineapple and simmer 30–60 seconds to warm through without breaking it down. Taste and adjust with a splash of water, soy sauce, or vinegar as needed.
Assemble the bowls: Spoon warm rice into each pineapple half.
Top with the teriyaki chicken mixture. Sprinkle with sesame seeds and the green parts of the green onions.
Serve: Bring the bowls to the table while hot. Provide spoons and forks; the bowls are edible-adjacent, not finger food.