In a shallow dish, whisk together olive oil, lemon juice, minced garlic, salt, and pepper.
Add the Mahi Mahi fillets to the marinade, ensuring they are well coated. Let marinate for at least 15 minutes at room temperature, or up to 30 minutes in the refrigerator.
Preheat your grill to medium-high heat.
Lightly oil the grill grates to prevent sticking.
Remove the Mahi Mahi fillets from the marinade, letting any excess drip off.
Grill the Mahi Mahi for about 4-5 minutes per side, or until cooked through and flakes easily with a fork. Cooking time will vary depending on the thickness of the fillets.
Serve immediately with your favorite sides.
Notes
This recipe is also great with other firm white fish like cod or halibut. You can also add herbs like parsley or cilantro to the marinade for extra flavor.