Prepare grill for direct grilling over medium heat, 350º - 450º.
In a small bowl, combine oil , rosemary , Blues Hog Bold & Beefy Seasoning. Poor over potatoes and stir to coat evenly.
Clean grill with cut onion half. Grill potatoes and close the lid until tender and brown on all sides 15-20 mins.
Remove from the grill and transfer to a serving bowl.
