For the Chimichurri Sauce
Place fresh herbs, salt, shallot, and garlic in food processor and pulse several times, scrapping down the sides of the bowl, until finely chopped. Add the vinegar and process for a few seconds. With the machine running, slowly add the oil. Stir in the dried oregano and chilli flakes.
For the Lamb
Remove lamb from refrigerator, place in a food storage bag with 60ml chimichurri sauce, coat chops well and let sit at room temperature for 30 minutes while the grill heats.
Prepare barbecue for direct heat and preheat to medium (about 200°c). Oil the grates.
Grill chops 3-4 minutes per side or until cooked to liking. Let rest for 5 minutes before serving with the rest of the chimichurri sauce.