To make the tapenade:
Place drained kidney beans, olives, tomato paste and basil leaves into a food processor and process until smooth.
Brush the chicken with olive oil and a little seasoning and heat a BBQ plate. Sear the chicken for 2 minutes each side and then place in a preheated oven (180C) to cook through for a further 12 minutes. Cover it loosely in foil to rest and stay warm.
Steam the bok choy.
Serve the chicken with the olive tapenade on the side and accompanying bok choy.