Sweet and Sour Pork with Pineapple - another family favorite

I believe this recipe is from America's test kitchen. Its really easy to make and is very tasty.

Sweet and Sour Pork with Pineapple

6 tablespoons rice vinegar (I sometimes use other vinegar if I don't have this)
1 (20 oz) can pineapple chunks and 6 tablespoons of the pineapple juice
6 tablespoons sugar
3 tablespoons ketchup
3 tablespoons soy sauce
1 tablespoon cornstarch
1 pork tenderloin (about 1 pound) sliced crosswise into 1/4 inch pieces - I have also used other cubed pork
3 tablespoons vegetable oil
1 red bell pepper, seeded and cut into 3/4 inch pieces
3 garlic cloves
1 tablespoon grated fresh ginger

1. Whisk vinegar, pineapple juice, sugar, ketchup, soy sauce and cornstarch together in bowl.

2. Pat pork dry with paper towels. Heat 2 tablespoons oil in large nonstick skillet over medium high heat until just smoking. Brown half of the pork, 1 to 2 minutes per side. Transfer to bowl and repeat with additional 2 teaspoons oil and remaining pork.

3. Add bell pepper and remaining oil to now empty skillet and cook until just softened, about 3 minutes. Add garlic and ginger and cook until fragrant, about 30 seconds. Add pineapple chunks, sauce mixture, and pork, along with any accumulated juices to skillet and simmer until sauce is thickened, about 2 minutes.

4. Freeze in double zip lock bags. For serving, thaw and heat.