Place roast in a roasting pan with the fatty side up. In a small bowl, mix together the garlic, olive oil, salt, pepper and thyme. Spread the mixture over the fatty layer of the roast. Let the roast sit out until it is room temperature, no longer than an hour. Heat oven to 500*. Bake the roast for 15 minutes then reduce the temperature to 325*. Continue roasting until the internal temperature reaches 135-140*.