Place onion slices on a sheet of heavy-duty aluminum foil, and top each with about 1 tsp. of butter, then season with the BBQ rub.

Fold over the edges of the foil and seal to make an envelope.

Now it’s time to grill the hot dogs. Grill them to your preferred degree of char, rotating often, until they reach an internal temperature of at least 160°F on a digital meat thermometer.

To toast your buns, open them and place them face down on the grill, directly over the coals. Watch your buns closely — they burn fast. Toasting takes anywhere from a few seconds to a minute, depending on how hot your coals are.