– 1 ½ pound [0.7 kg] of pork tenderloin, or boneless pork chops, thinly sliced – ½ teaspoon of black pepper (freshly-cracked, or ground) – 2 ½ teaspoons of salt, (or more, to taste), divided – 4 tablespoons of vegetable oil – 1 large of white onion, cubed – 2 green bell peppers, chopped – 3 cloves garlic, crushed – 1 cup of diced green tomatoes, (optional, see notes)
– 2 cups of fresh pineapple, peeled and cubed – ½ teaspoon of chili flakes, (optional) – 3 tablespoons of cornstarch – 2 tablespoons of light soy sauce – ¼ cup of rice vinegar, or 3 tablespoons of apple cider vinegar or white vinegar – 2 cups of pineapple juice – 1 cup of chopped garlic chive, (see notes) – 1 cup of chopped green onions