Step 1: Choosing a meat
But for this instructables, we'll be using steak. Flank steak, exactly. Other good popular options are brisket, london broil, and round. Basically, the cheap stuff.
Step 2: Cutting the meat
Once slightly frozen, slice 1/8" strips along the grain of the meat. Those are the lines you see going across the steak. You can use them as your thickness guideline, also.
Step 3: Marinade!
A traditional beef jerky would only have some salt and pepper, maybe paprika.
More contemporary recipes include soy sauce, terriyaki, peppers of all sorts and fruits as a marinade.
For the 2+ lbs of meat i had, my recipe went as so:
2/3 cup of soy sauce
<1/3 cup Worcestershire sauce (to taste, and completely unnecessary if you're like me and hate the stuff)
1/3 cup terriyaki sauce
1 tbsp garlic powder
1 teaspoon onion powder
lots of black pepper
Experiment! Then let it sit in the fridge overnight to soak in some flavor!