Pat beef dry with paper towels. Freeze for 30–45 minutes, then slice against the grain into 1/8–1/4 inch strips.
Mix kosher salt, rosemary, sage, garlic, and lemon zest in a bowl. Use your fingers to blend well.
Place beef strips in a large bowl. Sprinkle with the rosemary salt mixture, tossing to coat evenly.
Cover the bowl with plastic wrap and refrigerate for at least 4 hours (overnight for best flavor).
Preheat oven to 170°F (or dehydrator to 165°F). Arrange beef strips on wire racks over baking sheets, making sure they don’t touch. Dry for 4–6 hours, until firm but bendable.
Cool completely. Store jerky in an airtight container at room temp (2 weeks), in the fridge (1–2 months), or freezer (up to 6 months).