Combine the soy sauce, Bonini Traditional Balsamic of Modena DOP, Worcestershire sauce, liquid smoke and steak seasoning in a saucepan and bring to a boil. Reduce heat to low and simmer for about 10 minutes.
Remove from the heat and set aside to cool.
Pour the marinade into a plastic bowl and add the meat slices. Stir to coat and then cover and refrigerate for up to 2 days. Turn or stir occasionally to marinate the meat evenly.
Preheat the oven to 175 degrees F. Arrange the beef strips on a wire rack set over a baking sheet. If you like, you can sprinkle a little more steak seasoning on it at this point.
Bake for 60 to 90 minutes in the preheated oven, until dry but still pliable. Store in an airtight container in the refrigerator.
1/4 cup soy sauce
1/4 cup Bonini Traditional Balsamic of Modena DOP
1/4 cup Worcestershire sauce
2 teaspoons liquid smoke flavoring
1 and 1/2 tablespoons steak seasoning rub
1 (1 and 1/2-pound) London broil roast, thinly sliced along the grain