Made another batch today, and this is the end-of-the-line absolute best it gets. Highly influenced by Jay Guard's jerky photo.
Two major improvements:
1) I used London Broil and sliced it thick like Jay's. No more string-like pieces.
2) Instead of using a rack with drip pan underneath, I simply placed the strips on a cookie sheet. No more mess
Here is my updated recipe as of 7/10/2020:
Pablo E-Z Beef Jerky
Slice 1 lb. of London Broil into 6" long x 1" wide x 3/16" thick strips and place in bowl. Set aside.
In a small bowl mix together 1/2 tablespoon onion powder, 1/2 tablespoon garlic powder, and 1 teaspoon black pepper. Season the meat, using only half of the mixture. Then add 1 teaspoon red pepper flakes to the remaining spices, mix, cover and reserve for later. Cover and refrigerate the meat.
In a saucepan over medium heat, mix together:
1/4 cup brown sugar
1/3 cup soy sauce
1/4 cup teriyaki sauce
1/4 cup Worcestershire sauce
1/4 cup balsamic vinegar
3 tablespoons liquid smoke
1/3 cup pineapple juice
Heat the mixture until the brown sugar has dissolved. Remove from heat, let cool, then refrigerate until fully cold.
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Pour cooled marinade over the meat and mix by hand to coat. Seal the bowl, and refrigerate overnight.
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Pre-heat oven to 300. Lay meat strips onto a cookie sheet and sprinkle remaining spices on top. Insert on upper level of oven, 300 degrees for 10 minutes. Now reduce to "Warm" for about 3 hours. It's important not to overdry it. When you try to break a piece and it cracks, but doesn't break, it's perfect.