Place the meat directly on the smoker, close the lid and smoke the meat (about 30 minutes per pound). Internal temp: 115°F/46°C for rare, 125°F/52°C for medium rare, 135°F/57°C for medium, and 150°F/65°C for well done.
About 10 degrees before you reach the desired internal temp, heat a cast iron pan over high heat and melt the butter and add the garlic and fresh herbs. Sear the meat for 2-3 minutes per side, basting with butter as you sear the roast.