In a cocktail shaker or mixing glass, stir together the bourbon and simple syrup.
Add the bitters and orange zest.
If you are smoking the glass on a board: Smoke the glass (instructions below), add the ice cube and pour the drink over the top.
If you will be smoking with a cocktail smoker: Add the ice cube, pour the drink over top and smoke the drink (instructions below).
Place the rosemary in the drink and carefully light the end on fire to give it an extra smoky fragrance.
On a board
You’ll soak the board in water. It should be damp but not dripping. No beads of water should be visible.
Placed dry wood chips on top. Give them a blast a fire with the butane torch or a lighter.
Working quickly, place a dome or an empty glass upside-down on top.
Leave it there for about 30 seconds to a minute — smoke will fill the glass. The lack of oxygen inside will force the flame to fizzle out.
If you are using a glass: Turn it right side up and pour the cocktail (made in a mixing glass or another glass) right into the smoke.
If you are using a dome: Place the dome upside-down on top of your already-made cocktail. When you serve it to the lucky drinker, slowly remove the dome to make a smoky presentation.
With a cocktail smoker
Place about a tablespoon of wood chips in the basket. Don't overfill it. Rest the basket on top of the drink.
Light the wood chips on fire and quickly top with the lid to seal in the smoke.
Let the smoke billow and swirl inside of the glass for about a minute or so.
Then, lift the device off the cocktail and it will be filled with swaths of smoke.
Notes
Follow instructions for your specific cocktail smoker.
Safety tips
Always make sure you have a fire extinguisher handy.
Have a pair of oven mitts on hand to handle hot glassware.
Always direct the butane torch away from you, others and things that could catch fire.
Don’t overfill the basket with wood chips.
If you are burning wood chips on a wooden board, make sure the board has been moistened so that it does not catch fire. Do not use a plastic board.
Enjoy the smoke as it billows, but wait to take a sip until the smoke has withered away.