Let the steak stand at room temperature for 30 minutes to ensure even cooking. Meanwhile, rub it with salt, pepper, and garlic powder.
Preheat the smoker to 230°F (110°C). Distribute the charcoal or wood evenly in the smoker to ensure long and consistent smoke.
Lightly brush both sides of the steak with olive oil, then place it in the smoker. Smoke over low heat for about 45-60 minutes, or until the internal temperature reaches 122-131°F (50-55°C) for medium-rare.
While the steak is smoking, prepare the whiskey-mustard glaze: melt the butter in a saucepan, then add the honey, Dijon mustard, and whiskey. Cook over low heat for 3-5 minutes, or until slightly thickened.
Once the steak is sufficiently smoky, sear it on a high-heat grill grate for 1-2 minutes per side to develop a crispy crust.
Brush both sides of the steak with the whiskey-mustard glaze, then cook for another minute or so, until the glaze is lightly caramelized.
Remove the steak from the grill and let it rest for at least 10 minutes to allow the juices to redistribute.
After resting, slice the steak into thin slices, and serve with freshly made whiskey-mustard glaze and your favorite side dishes.
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