Mix the oil with vinegar, mustard and garlic.
Score the meat on both sides, season, then
put into a dish. Pour over the balsamic
mixture and leave to marinate for 5 mins.
Heat a griddle pan until very hot. Lift the
pork from the marinade, scraping off any
garlic, then cook for 4 mins on each side.
Remove the meat and keep warm. Pour the
marinade into the pan with the olives, cook
for 2 mins, then stir in the basil. Pour any
juices from the pork into the pan, drizzle the
sauce over the pork and serve with pasta.