Make the coffee dry rub. In a small bowl combine ground coffee, brown sugar, garlic powder, cayenne pepper, kosher salt, and pepper. Rub it all over the American Lamb.

Spray a 10.5 x 7.5 baking dish with non-stick cooking spray. Place the russet potatoes in the bottom of the dish and toss with olive, salt, and pepper. Next, take the American Lamb and place it on top of the potatoes.

Preheat the broiler. Place the baking dish underneath the broiler and crisp the outside of the lamb for 5 minutes on each side. Remove from the oven. Preheat the oven to 325 degrees.

Cook the lamb for another 1 hour and 20-30 minutes (roughly 20 to 25 minutes per lb) or until the internal temperature reaches 145 degrees for medium rare. Remove from the oven and allow to rest for at least three minutes before slicing and serving.