01 -
Set your oven to preheat at 400°F with the rack positioned in the center.
02 -
Grab a small pan and mix together the butter, garlic, herbs, salt, pepper, lemon juice, and lemon zest until everything is well blended. You can make this ahead if you'd like. Set it aside for now.
03 -
Use paper towels to thoroughly pat the mahi mahi fillets dry, removing as much moisture as possible. This is really important for getting a nice sear.
04 -
Sprinkle both sides of each fillet with a good amount of kosher salt and black pepper, then set them aside.
05 -
Heat the olive oil in a large oven-safe pan over high heat until it's really hot and sizzling. Add your fish fillets and let them cook undisturbed for about 3 minutes until the bottom is nicely browned. Don't be tempted to move them around.
06 -
Gently flip each fillet to the other side, turn off the stovetop burner, and immediately place the entire pan into your preheated oven.
07 -
Let the fish roast at 400°F for about 5 minutes until the top turns golden and the center is just cooked through. Be careful not to overdo it.
08 -
About a minute before your fish is ready, place the small pan with your lemon-garlic mixture over medium-high heat. Stir it constantly until the butter melts and the mixture starts bubbling.
09 -
Turn off the heat right away and drizzle the warm lemon butter sauce over the cooked fish. Don't forget to spoon over any delicious juices from the pan. Add some fresh lemon slices on the side for a nice touch.