Start by getting your grill ready about 15 minutes before you want to cook. You want it to reach that sweet spot between medium and medium-high heat—hot enough to create those beautiful caramelized marks, but not so hot that it burns the outside before the inside cooks through. Brush your grill grates generously with your neutral oil—this step is non-negotiable if you want those fillets to release cleanly and show off their gorgeous grill pattern. I like to use a folded paper towel held with tongs to oil the grates evenly. This also prevents sticking, which is the enemy of a beautiful presentation.

While your grill heats, make the star of your flavor profile. Take your softened butter—and I mean truly softened, not melted—and combine it with the lime zest and fresh lime juice in a small bowl. Stir this together gently until the zest and juice are fully incorporated into the butter. You'll notice the butter becomes this beautiful pale yellow-green color, and that's when you know you're doing it right. This is the moment I encourage you to taste a tiny bit on your finger (food safety-wise, from a clean spoon) to make sure the lime flavor is singing. Set this mixture aside in a place where it'll stay slightly cool but workable—you'll need to brush it on the fillets just before they hit the grill.

Pat your grouper fillets dry with paper towels—this is absolutely crucial for getting that crispy exterior. Don't skip this step, because any excess moisture will steam the fish instead of sear it, and you'll lose those beautiful grill marks. Once they're dry, lay them out on a clean cutting board. Now comes the seasoning: brush each fillet generously with your citrus butter on both sides. Be generous here—this butter is flavor and visual appeal rolled into one. Sprinkle your sea salt and freshly ground black pepper on both sides of each fillet. I like to season right before grilling rather than too far ahead, because salt can draw out moisture from the delicate fish.

Carefully place each fillet on your prepped grill grates, skin-side down. This is your moment to create those magazine-worthy grill marks. Don't move them around—let them sit undisturbed for 4 to 5 minutes. Resist the urge to flip or fuss. During this time, the skin is making contact with the heat, developing that beautiful caramelized exterior. You'll see the flesh start to turn opaque around the edges, creeping up toward the center of the fillet. That's your visual cue that the first side is nearly done. After about 4 to 5 minutes, gently flip each fillet using a fish spatula or thin metal spatula. Handle them with care to keep them intact—a whole, unbroken fillet is far more visually impressive than one that's fallen apart. Now cook the second side for another 4 to 6 minutes until the entire fillet is opaque and flakes gently when you test it with a fork. The flesh should go from translucent to that beautiful white throughout.

The moment your fish is cooked through, transfer it to your serving platter or individual plates. Brush any remaining citrus butter over the top of the warm fillets—this is when that butter will melt slightly and create that gorgeous glossy finish. Now here's a pro tip from my years working with food: tent the plate loosely with aluminum foil and let it rest for 5 minutes. This allows the carryover cooking to stop, the juices to redistribute, and the fish to relax into its most tender state. It also keeps everything warm without continuing to cook the outside.