Southwest Beef Fajitas

The key to great fajitas is in the slicing, not the marinade. Cutting beef round steak diagonally across the grain into thin strips (roughly ¹⁄₈ inch) before marinating, not after, means every piece gets thoroughly seasoned and cooks in 5 minutes flat under a hot broiler. Thick chunks of meat would need twice the time and never get the same flavor penetration.

The marinade is unusually simple: lime juice, vegetable oil, ground red chili, and garlic. No cumin, no oregano, no beer, just citrus, fat, heat, and allium. An hour is enough for the slices to soak up everything. Much longer and the lime starts cooking the meat ceviche-style, which makes it mealy once broiled.

Broiling (rather than searing in a skillet) is traditional for Tex-Mex fajitas. The high overhead heat mimics grill flames and gives the beef char on its edges without overcooking the thin slices through to dry.

Serve with warm flour tortillas, cucumber salsa, southwest relish, and guacamole, all folded burrito-style.

Chef Tips

• Slice beef while slightly frozen; it’s easier to cut paper-thin.
• Drain the marinated meat briefly before broiling; excess liquid creates steam instead of char.
• Warm tortillas in a dry skillet or wrapped in foil in a low oven before serving.
• Don’t crowd the broiler pan; meat needs space to char, not stew.

Variations

• Swap skirt steak or flank for round steak; more traditional for fajitas.
• Add sliced onions and bell peppers to the broiler pan for classic fajita veg.
• Serve with queso fresco, pickled onions, and cilantro for extra texture.