During the aging process, the whiskey is drawn in and out of the wood giving it its distinctive colour and flavour.
A portion of whiskey remains in the wood after the barrels are emptied.
Some of these barrels are made onto Jack Daniels wood chips.
Place the chips onto the hot coals or make a foil pouch with a small hole in, which allows the smoke to escape.
Alternatively buy a smoker box to put the chips in.