In a small bowl, whisk together 0.25 tablespoons of olive oil, chopped rosemary, chopped thyme, minced garlic, sea salt, and black pepper.
Rub the herb mixture thoroughly over both sides of the lamb chops and let them marinate at room temperature for 15 minutes.
Preheat a grill or cast-iron grill pan over medium-high heat.
Toss the asparagus spears with the remaining 0.25 tablespoons of olive oil and a small pinch of salt.
Place the lamb chops on the hot grill and cook for 4-5 minutes per side for medium-rare, or until they reach your desired level of doneness.
Grill the asparagus alongside the lamb for 5-7 minutes, turning occasionally, until tender and slightly charred.
While the meat rests, stir together the Greek yogurt, chopped mint, and lemon juice in a small ramekin.
Serve the grilled lamb chops and charred asparagus immediately with the zesty mint yogurt sauce on the side.