Easy Sweet and Sour Chicken

Name: Easy Sweet and Sour Chicken
Prep time: 15 min
Cook time: 15 min
Total time: 30 min
Cuisine: Asian
Ingredients: 1 tbsp groundnut oil (divided); 1 1/2 pounds boneless skinless chicken breasts; 2 red bell peppers (cut into 1-inch chunks); 1 yellow bell pepper (cut into 1-inch chunks); 1 small yellow onion (cut into 1-inch chunks); 3 garlic cloves (minced); 1- inch knob of ginger (grated or minced); 1/4 cup low sodium soy sauce (or coconut aminos liquid); 2 tbsp honey; 2 tbsp Worcestershire sauce; 1 tbsp white vinegar; 1 tbsp tomato paste; 2 tbsp cornstarch; 1 small pineapple (or 1/4 from a big pineapple); 2 tbsp thinly sliced green onion for serving; 2 tsp toasted sesame seeds for serving; Optional: cooked rice