With a sharp knife, remove any silver skin/sinew and excess fat.
In a small bowl, whisk together the olive oil, lemon juice, salt and pepper. Pour the marinade over the pork and allow to marinate for 30 minutes or ideally up to 24 hours in the fridge. Remove the meat from the fridge an hour before cooking to allow it to come to room temperature.
Preheat a grill or grill pan over medium-high heat then cook the pork for 7-8 minutes per side until golden brown on all sides. To test for doneness, insert a meat thermometer and if it reaches 145ºF/62ºC, the pork is done. I prefer removing the meat from the heat at 140ºF/60°C as it will continue cooking while it rests.
Allow the pork to rest for 5-10 minutes while you make the sauce.
Combine the capers, chopped herbs, garlic, lemon juice and zest and olive oil in a small bowl then season with salt and pepper.
Slice the pork and serve with the lemon caper sauce and extra lemon wedges for squeezing.