1. Combine cumin and garlic; press evenly onto beef steaks.
2. Place steaks on grid over medium, ash-covered coals. Grill, uncovered, 15 to 18 minutes for medium rare to medium doneness, turning occasionally.
3. Squeeze juice from 1 lime wedge over each steak. Carve steaks into thin slices. Serve with guacamole; garnish with lime wedges, if desired.
Cook's Tip: To broil, place steaks on rack in broiler pan so surface of beef is 3 to 4 inches from heat. Broil 13 to 17 minutes for medium rare to medium doneness, turning once.