Preheat the oven to 200°F degrees (or "keep warm" setting). Pat lamb chops dry with a paper towel.
In a small bowl, mix together the pepper, salt, rosemary and thyme. Season both sides of the lamb chops with seasonings.
Heat a large cast-iron skillet over medium high heat. If not using a well-seasoned cast iron, use a stainless steel skillet and add just enough oil to coat the bottom.
Add half of the lamb chops to the hot pan, being careful to not overcrowd the pan. Cook for 2-3 minutes on each sides until chops are rare or medium rare.
Remove the lamb chops to a baking sheet and place in the oven to keep warm. Repeat with next batch. Keep warm until ready to serve, being careful not to overcook.
Plate the lamb chops and top with a generous helping of romesco sauce.
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