Making your own beef jerky with a dehydrator is easy! First, you'll want to choose a lean cut of meat: eye of round roast, top & bottom round roasts, Flank steak, and sirloin tips work best. Be sure to trim any excess fat. Then, place the meat in the freezer for 1 to 2 hours, which should help make it easier to make uniform slices. Slice the meat against the grain, in 1/8 to ¼ inch slices. If using a marinade, submerge your slice and refrigerate for at least 6 to 24 hours. The longer it marinates, the more flavor it will absorb. Finally, lay the meat flat on the dehydrator racks, set your dehydrator to 165 degrees, and wait for your very own, homemade beef jerky!