Combine the zest and juice of 2 limes, Olive Oil, Mustard, Worcestershire, Soy, 3 onions, 2 garlic cloves salt and pepper and mix well.
Cut chicken into even cutlets and place in a gallon sized baggie.Pour marinade over the chicken and marinate for 1 hour.
Preheat grill.Place chicken on grill and grill for 7 minutes.Then flip and cook until internal temp reaches 170.Remove from grill and let meat rest.
Meanwhile combine juice and zest of one lime with extra virgin olive oil, 3 chopped onions, 2 minced garlic cloves, & basil.Slice chicken into bite-sized pieces and pour sauce over top.