Heat oil to brown chicken, brown chicken in at least two batches, about 6 minutes per batch flipping chicken pieces . In the meantime in a bowl, add pineapple juice, water sugar and ketchup, and remaining 1 ½ tbsp cornstarch and whisk well to dissolve sugar. When done frying chicken, set aside remove oil from pan, leaving about 1 tbsp, add the onions, bell peppers, garlic , ginger and crushed pineapple and sauté for about 3 minutes. Add the sauce with the 1 tbsp hot sauce , stir to combine well, add the liquid mixture and bring to a low boil, stir well, cook for about 2 minutes, Add the fry chicken and stir well to combine.