slow-cooked general tso's chicken

Ingredients

• 2 pounds chicken breasts, cut into cubes
• 1 cup cornstarch,divided
• 1/2 teaspoon each, salt and pepper
• 2 tablespoons sesame oil, can use canola oil
• 1/2 cup sugar
• 1/2 cup light soy sauce
• 1/2 cup unsweetened pineapple juice
• 1/3 cup apple cider vinegar
• 4 teaspoons minced garlic
• 1/2 teaspoon cayenne pepper
• 1/4 teaspoon ground ginger
• 1/3 cup chopped scallions
• 2 cups cooked broccoli florets, prefer steamed
• 1-1/2 cup cooked white rice, can use brown rice