Step 1

To a blender, add: the oil, vinegar, garlic, oregano, thyme, lemon juice, and Dijon mustard, season with salt and pepper, to taste. Blend until thoroughly combined. Pat the lamb dry and put it on a shallow platter. Season all over with salt and pepper. Pour half of the vinaigrette over the lamb, turning the meat to get it well coated. Marinate in the refrigerator for 2 hours. Remove the marinated meat from the refrigerator about 30 minutes before grilling.

Step 2

Heat the grill (or large cast iron skillet) and oil it lightly. Remove the lamb from the marinade and grill for about 15 to 20 minutes per side for medium-rare. (Adjust the time accordingly for other degrees of doneness.) Transfer to a cutting board and let rest for 10 minutes.

Step 3

Toss the mache (or mixed baby greens), mint leaves, and scallions in a bowl and dress the salad with about 3 tablespoons of the reserved vinaigrette. Season with salt and pepper. Slice the lamb into thick slices and serve with greens.