Mix together garlic, onion powder, herbs, & sea salt in a bowl. Add in softened butter, vinegar, and mix together.
Place pork loin on 2 large sheets of heavy-duty aluminum foil. Rub the butter mixture all over pork. Spread the remaining butter mixture on top of the pork.
Tightly wrap the pork loin with foil and place it on a heavy-duty sheet tray.
Place in Bull Grill preheated to 350 degrees using indirect heat. Turn outer burners to medium to medium-high and the center burners off.
Cook pork to the desired temperature. Remove from heat and rest for 10 minutes. Serve with pan juices. Garnish with fresh herbs.