Trim any excess fat from the flank steak as it will hinder the drying process.
After trimming, place the meat in a zip-top bag and freeze it for about 1-2 hours to firm up.
Once the meat is firm, slice it thinly against the grain for tender jerky.
The pieces should be about 1/8 inch thick.
In a large resealable bag, combine Worcestershire sauce, soy sauce, honey, black pepper, onion powder, liquid smoke, and red pepper flakes to make the marinade.
Add the beef slices into the bag, ensuring they're thoroughly coated and marinate for 3-6 hours, preferably overnight.
Remove the marinated beef from the fridge and arrange it on air filters, laying the strips across the grooves.
Then, stack the filters on top of one another.
Use a box fan to dry the meat by securing the stacked air filters with bungee cords.
Set the fan on high for 8-12 hours until the meat is dehydrated to your liking.