1Prepare a simple marinade by combining olive oil, soy sauce, red wine vinegar, lime juice, brown sugar, Dijon mustard, chili flakes, garlic powder, and black pepper in a plastic container.
2Whisk all the marinade ingredients together until well combined.
3Add the flank steak to the marinade, ensuring both sides are fully covered.
4Close the container with a lid and refrigerate the steak for at least 30 minutes, or preferably an hour, to marinate.
5Remove the steak from the marinade and wipe off any excess marinade.
6Place the marinated flank steak on the smoker at 225°F (107°C).
7Cook the steak until its internal temperature reaches 125°F (52°C).
8Use a sear pro to give the steak a nice crust.
9Take the steak inside and let it rest.
10Cut the steak to reveal its juiciness and perfect cook.