First, you want to ensure your chicken is in manageable pieces. If you're using whole chicken parts, pat them dry with a paper towel to get them nice and crispy when they cook.

In a medium saucepan, melt the butter over medium heat. After it’s melted, add the grated ginger and sauté for about a minute until fragrant.

Stir in the pineapple (make sure it’s drained), ketchup, brown sugar, salt, apple cider vinegar, and soy sauce. Bring this to a simmer, then mix in cornstarch to thicken. Keep stirring until it’s well combined.

In a large skillet or grill pan, heat a drizzle of oil over medium-high heat. Add your chicken pieces and sear them until golden brown on both sides. About 5-7 minutes per side should do it.

Once the chicken is browned, lower the heat and pour the pineapple sauce over the chicken pieces.

Cover the skillet and let it simmer for around 20 minutes. This allows the chicken to absorb all those sweet and tangy flavors thoroughly.

After the 20 minutes, remove the lid and sprinkle in the green onions for some added color and flavor. Give it a quick stir and let it cook for another 5 minutes without the lid.