Trim off any visible fat — this helps your jerky last longer. Slice the beef thinly (around 5 mm thick). For chewy jerky, slice with the grain; for a softer bite, slice against it.
In two separate bowls, whisk together the ingredients for each marinade. Divide the beef equally and make sure every piece is coated. Cover and marinate for at least 6 hours — overnight is even better. However, if you need it faster, you can get away with 30 minutes.
It is normally recommended to drain and dry. However, I have never done this and mine always turns out lovely. Use paper towels if you wish to pat the dry.
Using a Dehydrator (Bio Chef or similar): arrange strips in a single layer on the trays. Dry at 70 °C for around 6–7 hours, or until the jerky is dry but still slightly bendy. Mine only took 3 hours, so please check it every hour.
Using an oven: line baking trays with racks and set your oven to 70 °C (fan on). Wedge open the door slightly with a wooden spoon handle to allow air circulation. Dry for 3–5 hours, checking occasionally.
Once done, let the jerky cool completely before storing in airtight jars or resealable bags. It’ll keep for 1–2 weeks at room temperature or longer in the fridge.