Place flank steak in a freezer-safe plastic bag and freeze for 30 minutes to 1 hour, until firm and easier to slice. Remove steak from freezer and slice against the grain into 1/8-inch thick strips.
In a mixing bowl, combine beer, soy sauce, brown sugar, garlic, red pepper flakes, onion powder, black pepper, and lime juice.
Place steaks in a resealable plastic bag and add marinade. Marinate at least 2 hours, up to 24 hours.
Heat oven to 175°F. Place wire racks on two foil-lined baking sheets. Lay beef strips out on racks and bake until jerky is firm but still a bit pliable, about 4 hours. Flip once during baking and check regularly to make sure the jerky is drying evenly.
Notes
* - We used round Rib Eye steaks instead of the flank steak