Slice your beef into ¼” thick slices and your desired length.
Place the beef into a bowl along with the soy sauce, Worcestershire sauce, and rainbow peppercorns. Cover and let marinate in the fridge for 12 to 24 hours.
After marinating, remove the beef from the marinade and transfer it to the jerky trays. Make sure you leave some space between each slice to let the air circulate.
Set your dehydrator to 140°F and place the trays inside. Let the jerky dehydrate for 3 to 4 hours until fully dehydrated.
After you remove the jerky from the dehydrator, sprinkle the coarse ground black pepper over the top.
Store in an airtight container for up to a week.
Notes
If you can't marinate for 12 to 24 hours, you can get away with 3-4 hours if you’re crunched for time. You’ll know when your jerky is done as it will have a slight bend and is no longer moist.