First, I slice the pineapple in half lengthwise (leaving the stem intact for presentation). Then I angle my knife around the perimeter, making sure not to cut through the skin, and cut across the fruit inside. I scoop out the fruit pieces with a spoon, reserving about one tablespoon of pineapple juice for the sauce.
In a small bowl I whisk together the soy sauce, brown sugar, reserved pineapple juice, garlic, ginger and sesame oil until smooth. This creates that sweet-savory teriyaki style glaze which really ties the dish together.
Heat the vegetable oil in the skillet over medium-high heat. Season the chopped chicken with salt and pepper and add to the skillet in an even layer. Cook for about 3-5 minutes per side (depending on size) until nicely seared and nearly cooked through.
Pour the prepared sauce over the chicken in the skillet and bring to a gentle simmer. In a separate small bowl whisk the cornstarch and water to make a slurry, then stir that into the skillet along with the chicken and sauce. Let it simmer for 8-10 minutes until the sauce is thickened and the chicken is cooked through.
Divide the chicken and sauce mixture among the pineapple halves (or into bowls if you prefer). Garnish with sesame seeds and thinly sliced green onions. At this point you’ve got a vibrant, flavourful dish ready to serve and enjoy.