Rinse the rice under cold water until the water runs clear. In a pot, combine the rice with 4 cups of water and bring to a boil. Reduce heat to low, cover, and let it simmer for about 15-20 minutes, or until the rice is tender and water is absorbed. Remove from heat and let sit covered for another 5 minutes.
In a large skillet or wok, heat the vegetable oil over medium heat. Add the diced chicken and season with salt and pepper. Cook for about 5-7 minutes, or until the chicken is browned and cooked through. Remove the chicken from the skillet and set aside.
In the same skillet, add the diced onion, garlic, and bell pepper. Sauté for about 3-4 minutes, or until the vegetables are softened.
Add the reserved pineapple juice, soy sauce, honey, and ground ginger to the skillet. Stir well to combine. Bring the mixture to a simmer for 2-3 minutes.
Return the cooked chicken to the skillet along with the pineapple chunks. Toss everything together and cook for an additional 5 minutes to let the flavors meld.
Fluff the cooked rice with a fork and divide it among serving plates. Top with the pineapple chicken mixture.
Garnish with chopped green onions and sesame seeds if desired. Serve immediately and enjoy!