In a large deep pan, preheat the oil to medium heat.
Pat dry the chicken tenderloins, cut into one inch cubes and transfer to a bowl.
Add the corn starch to the chicken and toss around to coat well. Set aside.
In two other small bowls, beat the eggs in one and mix together the flour coating mix ingredients in another.
Dip one piece of chicken into the egg bath and then into the dry flour coating mix. Transfer the piece on a cookie rack and repeat steps for the remainder of the chicken pieces.
Fry the chicken pieces in the heated oil for about 5-7 minutes, or until golden brown and crispy. Do not overcrowd the pan. Cook them in two batches if your pan is small.
Remove the chicken from the frying pan and set on a plate lined with paper towel. Set aside.
In a bowl or cup, mix together the sweet and sour sauce ingredients.
Heat another pan over medium heat, add in the light tasting olive oil. Pan sear the cubed veggies (not the pineapple) until tender. Remove and set aside. About 3-4 minutes.
In the same pan, add in the sweet and sour sauce mix. Simmer on medium low heat, mixing constantly until the sauce thickens up. About 2-3 minutes.
Once the sauce has thickened up, add in the chicken, veggies and pineapple chunks. Mix together to coat well and cook for another 2-3 minutes.
Remove from heat and garnish with some sesame seeds if desired.