In a medium bowl, toss the cubed chicken with the sesame oil and season with salt and pepper.
Heat a large sauté pan or wok over medium heat and add 1 tablespoon vegetable oil. Let the pan heat for 2 minutes then add the chicken and cook, stirring, until the chicken is cooked throughout.
Add the remaining 1 tablespoon of vegetable oil then add the onion, garlic and ginger and cook, stirring occasionally, until the onion softens, about 2 minutes. Add the carrots and cook 1 more minute until they've softened slightly.
Stir in the scallions, rice, peas and chopped pineapple.
Drizzle the rice with the soy sauce then stir to combine. Season the rice with salt and pepper and serve.
Use a sauté pan that has at least a 2-inch rim so that all of the ingredients can be properly stirred without overflowing from the pan.