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Preheat oven to 350 degrees F.
Combine garlic, olive oil, rosemary, thyme, mustard, salt, and pepper in a bowl. Rub all over the leg of lamb.
Drizzle the potatoes with olive oil, then sprinkle with salt and pepper and place in the bottom of a casserole dish or roasting pan. Place the leg of lamb on top.
Roast for 1 1/2 to 2 hours (longer if using bone-in) until you reach medium-rare, which is 130-135 degrees F on a digital meat thermometer inserted into the center of the lamb.
Remove from oven and let the lamb rest for 15 minutes before slicing and serving.
1 hours, 25 minutes