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