Step 1

Stir together lime juice, 1 1/2 Tbsp oil, and cumin. Place fillets in a zip-top plastic freezer bag; pour lime juice mixture over fish. Seal and chill 15 to 30 minutes, if desired.

Step 2

Preheat grill or grill pan to medium-high heat. Remove fish from marinade; discard marinade. Sprinkle fish with garlic salt.

Step 3

Grill on a grill rack rubbed with olive oil, covered, 5 minutes per side or until fish flakes with a fork.