Blend pineapple until you have ⅛ cup of pineapple juice. It took about two slices of pineapple with a little juice.
Place that in a bowl and add in the BBQ sauce, stir together.
Lay chicken breast out on a cutting board. Cut chicken breast in half, seperating the thin half from the thicker half. Set the thicker side upwards and cut in half, like butterflying the chicken, to thin it out. There should be 6 pieces total.
Add to the bowl of pineapple and BBQ and toss to coat the chicken completely.
Let the chicken marinate while slicing the vegetables.
Cut pepper and onion into thin strips.
Once the grill is heated, place the chicken on the heated grill. Cook the chicken for about 15 minutes, or until fully cooked. Flip the chicken every few minutes.
Add a skillet to the top of the grill and heat it up. Add pepper and onion slices and saute until desired wellness.