Trim away as much of the fat cap as possible from the upper side of the rack of lamb. This will reduce fire flare-ups while the lamb is grilling (if you are using a charcoal grill).
Remove the silver skin (thin membrane) by inserting a paring knife under the membrane and then pulling it off.
Place the rack of lamb into a closable plastic bag.
In a small dish, whisk together the oil, lemon juice, garlic, herbs, salt, pepper, and the red pepper flakes.
Pour the mixture over the lamb and seal the bag. Refrigerate 3-4 hours, turning the bag occasionally.
When ready to grill, transfer the marinated lamb to a plate while preparing the grill.
Prep a hot grill with a two-zone heat (or prepare to turn the heat down if using a gas grill or pellet grill) and place an aluminum pan in the center of the bottom of the grill. The hot side of the grill should be about 450°F.
Place the rack of lamb, bone-side up, over the hot grill grates. Sear, turning with tongs, until browned on all sides. If a fire flares up, shift the rack of lamb to the cooler zone until the flames die off, then back over to the hot zone. If you have a pellet grill, just let them sit with the lid closed for 15 minutes.
When completely seared on all sides, move the lamb to the cooler zone or turn the temperature down to 300°F. Close the grill cover and finish cooking, about 8-10 minutes.
Use a good meat thermometer to check for doneness, rare will be 120°F, medium rare 125°F, medium 130°F and well done at 145°F.
Once the lamb has reached the desired temperature, remove it from the grill, place it on a platter, and loosely tent it with aluminum foils to let it rest for 10-15 minutes. Remember that the lamb will continue to cook for an additional 5 to 8 degrees from residual heat. (We removed our lamb at 122°F for a desired doneness of medium-rare.)
When ready to serve, slice between the ribs, either in servings of 1 or 2 chops per serving.