Get out and measure your ingredients.
Add buttermilk to a large resealable bag.
Add rosemary, coffee beans, peppercorns, bay leaves and crushed garlic cloves Adjust until blended.
Add steak to a resealable bag and pour the marinade inside along with it. Refrigerate for at least 6 hours.
When ready to cook, preheat the smoker to 180* lid closed for 20 minutes and remove the steak from the refrigerator. Keep in the marinade and let it come to room temp as the smoker preheats.
Remove the steak from the marinade and place onto a wooden cutting board. Pat dry with a paper towel.
Season with sea salt flakes and fresh cracked black pepper on both sides.
Place steak directly onto oiled grill grates. Smoke for 60 minutes.
After 60 minutes, remove the steak from the smoker and increase the heat to 450 degrees. Place a cast iron skillet inside the smoker as it heats.
Finely slice the shallot and place atop the steak.
Once the smoker reaches temp, add butter to the skillet. It will immediately start to melt. Place the steak atop the butter. Add 3 sprigs of Rosemary along the sides of the steak. Baste with melted butter and close the lid.
Cook for 10 more minutes, or until steak reaches an internal temp of 125 degrees.
Remove skillet from the smoker and baste steak with butter several times.
Remove steak from the skillet and let rest on a wooden cutting board as it finishes coming to temp. It will reach 130 degrees within about 10 minutes.
Thinly slice steak diagonally against the grain of the meat.
Serve with your favorite veggies and enjoy every bite!