Place cauliflower in a glass baking dish with onion, BBQ rub, butter, & garlic
Place in Bison Charcoal Grill for 1 hour. Remove from Bison Charcoal Grill and place contents of the baking dish in the blender. Add in heavy cream and cheese and carefully blend until it’s to your desired consistency. You might have to add a little more heavy cream if it's too thick. Be very careful removing the blender lid to avoid the hot steam.
Garnish with herbs and serve hot.