pork tenderloin - 1 (cut into bite-sized pieces)
vegetable oil - 1 tablespoon (for stir frying)
dark soy sauce - 1 tablespoon
cornstarch - 3 tablespoons (for velveting and sauce thickening)
white vinegar - 1/3 cup
light soy sauce - 1 tablespoon
white sugar - 1/3 cup
worcestershire sauce - 1 teaspoon
oyster sauce - 1 teaspoon
ketchup - 1/4 cup
pineapple juice - 1/4 cup
fresh ginger - 1/2 inch piece (grated)
garlic - 1 clove (grated)
onion - 1/2 cup (chopped)
red bell pepper - 1/2 cup (chopped)
green bell pepper - 1/2 cup (chopped)
pineapple - 1/2 cup (chopped)