If you have a rotisserie us that, if not do a reverse sear.
I also like to stud my roasts with garlic but since you are only going to cook the roast for a short time you won't benefit much from using whole cloves. What I like to do is crush some whole cloves of garlic and some whole peppercorns and sometimes some red pepper flakes added in a mortar and pestle and then stud the roast with that mix. I also like to use just salt and pepper for seasoning it and try and slice it as thin as you can, it makes killer sammies.