Begin by taking a piece of flank steak and cutting it into strips that are about an inch wide. Next, take these strips and marinate them in any type of sauce you like. Seasoned jerky makers recommend adding some liquid smoke to your marinade to give it a smoky taste. You can also use a teriyaki marinade, steak, soy, or barbeque sauce. Thoroughly cover your meat and allow it to baste from 8 to 24 hours.
Place the marinated beef in an oven on very low temperature. Somewhere around 100 to 125 degrees Fahrenheit is normally sufficient for baking the jerky. You can also put the meat on a gas grill or in a smoker. When cooking beef jerky in this manner, it is important to keep an eye on the meat to prevent it from overcooking and also to prevent fires. Cooking beef jerky by using one of these methods can take 18 hours or longer, so you may want to have someone else help you take shifts while preparing it.
Since leaving an oven or grill burning for such a long time is often intimidating, many people prefer to use a food dehydrator to make beef jerky. This can take 12 to 24 hours to complete, but the risk of fire is much less than it is with an oven, grill, or smoker.