01 - Freeze beef for 1 hour to firm it for easier slicing.
02 - Cut beef against the grain into 1/8–1/4 inch thick strips.
03 - Combine soy sauce, Worcestershire sauce, brown sugar, smoked paprika, black pepper, onion powder, garlic powder, chili flakes, and cumin in a large bowl.
04 - Add beef strips to the marinade and toss to coat thoroughly. Cover and refrigerate for at least 8 hours, stirring occasionally.
05 - Set oven to 160°F or set food dehydrator to the same temperature.
06 - Remove beef from marinade and pat dry with paper towels to remove excess moisture.
07 - Lay beef strips in a single layer on wire racks over baking sheets or dehydrator trays, ensuring pieces do not overlap.
08 - Dry in the oven with the door slightly ajar or in the dehydrator for 4 to 5 hours until the beef is dry, firm, and bends without breaking.
09 - Allow jerky to cool completely before storing it in an airtight container.