This is so delicious, it just melts in your mouth! I’m drooling just thinking about it!

2 pounds pork shoulder, cut into chunks
1/2 cup hoisin sauce
1/4 cup soy sauce
2 tablespoons rice wine vinegar
2 tablespoons brown sugar
3 cloves garlic, minced
1 tablespoon fresh ginger, grated
1 tablespoon sesame oil
1/2 teaspoon black pepper
1/4 teaspoon red pepper flakes
1 cup pineapple chunks
2 bell peppers, sliced
1 tablespoon cornstarch
2 tablespoons water
Scallions, sliced, for garnish
Sesame seeds, for garnish