Add butter and seasonings to the pan and place it in a warm but not hot area of your grill for easy access whenever you notice the meat needs a little extra moisture.
The small pan's manageable size and weight mean it won't take up too much space on your grill, and its cast-iron properties ensure it can withstand the heat.
Flavor the butter with fresh herbs and garlic or a drizzle of honey and chili flakes. The easy-accessible basting station will add flavor and moisture to the meat.
Note that butter has a low smoke point, so if it starts to smoke, move it to a cooler spot on the grill or use a clarified butter like ghee which has a higher smoke point.