01 - Rinse rice under cold water until water runs clear. Combine rice, water, and salt in a saucepan. Bring to a boil over medium-high heat, then cover and reduce heat to low. Simmer for 15 minutes. Remove from heat and let steam, covered, for 10 minutes.
02 - In a mixing bowl, toss chicken pieces with 2 tbsp soy sauce and cornstarch until evenly coated. Let marinate for 10 minutes at room temperature.
03 - In a small bowl, whisk together soy sauce, honey or brown sugar, rice vinegar, sriracha (if using), grated ginger, minced garlic, and pineapple juice until smooth and well combined.
04 - Heat vegetable oil in a large skillet or wok over medium-high heat. Add marinated chicken pieces in a single layer and cook for 5 to 6 minutes, turning occasionally, until golden brown and cooked through. Remove chicken and set aside on a plate.
05 - In the same skillet, add a splash of oil if needed. Stir-fry red onion and bell pepper for 2 to 3 minutes until slightly softened. Add sugar snap peas and pineapple chunks, cooking for another 2 minutes until heated through but still crisp-tender.
06 - Return the seared chicken to the skillet. Pour the prepared sauce over the chicken and vegetables, tossing everything to coat evenly. Cook for 2 minutes until the sauce thickens and clings to the chicken and vegetables.
07 - Divide the cooked rice among four bowls. Top generously with the chicken, pineapple, and vegetable mixture. Garnish with sliced spring onions and toasted sesame seeds if desired. Serve immediately.