In a bowl, toss the pork pieces with salt, pepper, and cornstarch until well coated.
Heat the vegetable oil in a large skillet over medium-high heat.
Add the coated pork pieces to the skillet in a single layer. Cook until golden and crispy, about 5-7 minutes, turning occasionally. Remove and set aside.
In the same skillet, add the diced onion and bell pepper. Sauté for 2-3 minutes until slightly softened.
Add the pineapple chunks and stir for another minute.
In a small bowl, whisk together the soy sauce, ketchup, sugar, rice vinegar, garlic powder, and ginger powder. Pour this sauce over the vegetables in the skillet.
Return the crispy pork to the skillet and toss everything together until the pork is well coated in the sauce. Cook for an additional 2-3 minutes until heated through.
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