4 swordfish steaks (6-8 oz / 170-225 g each, 1 to 1.5 inches thick) 1 / 4 cup (60 ml) extra-virgin olive oil 2 tbsp (30 ml) fresh lemon juice 1 tsp lemon zest 3 garlic cloves, minced 2 tbsp fresh parsley, finely chopped 1 tbsp fresh oregano, finely chopped (or 1 tsp dried oregano) 1 tsp Dijon mustard 1 / 4 tsp red pepper flakes (optional) 1 1 / 4 tsp kosher salt, plus more to taste 1 / 2 tsp freshly ground black pepper Neutral high-heat oil for grill grates Lemon wedges, for serving
Pat the swordfish dry with paper towels and set aside. In a bowl, whisk together the olive oil, lemon juice, lemon zest, garlic, parsley, oregano, Dijon, red pepper flakes (if using), salt, and black pepper. Measure out and reserve 2 tablespoons of the marinade in a small cup for basting/finishing. Do not let this portion touch the raw fish. Place swordfish in the remaining marinade and turn to coat. Marinate 15-30 minutes (refrigerate if going longer than 20 minutes). Preheat a gas or charcoal grill to medium-high heat (about 425-475 F). Clean and oil the grates well with a lightly oiled towel or brush. Remove swordfish from the marinade, letting excess drip off; discard any marinade that touched the raw fish. Oil the fish lightly if needed. Place on the grill over direct heat. Grill for 3-4 minutes on the first side until well marked. Flip and grill another 2-4 minutes, basting in the last minute with the reserved clean marinade, until the centers are opaque and an instant-read thermometer reads 135-140 F (carryover will rise). For USDA doneness, cook to 145 F. If flare-ups occur, move fish to a cooler zone. Total cook time is typically 6-8 minutes for 1-inch steaks and 8-10 minutes for 1.5-inch steaks. Transfer to a plate and rest 5 minutes. Spoon any remaining reserved clean marinade over the top, if desired. Serve with lemon wedges and a pinch of salt to finish.
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