Sicilian Lemon Caper Swordfish Marinade

Steps

1. 1

   Zest and juice lemons

   • Using a fine zester or microplane, remove the zest from the lemons into a small bowl.
   • You should have about 2 tablespoons (15 g) of zest.
   • Then cut the lemons in half and juice them into another bowl, straining out any seeds.
   • You should have about 1/2 cup (120 ml) of fresh lemon juice.

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   Ready when: Lemons are fully zested and juiced

   Tip: Use a microplane grater for fine zest that avoids the bitter white pith underneath the colored layer

2. 2

   Mince the garlic

   • Peel and mince the 4 garlic cloves as finely as possible.
   • You should have about 1–2 tablespoons (20 g) of minced garlic.
   • If you prefer a smoother marinade, use a garlic press instead.

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   Ready when: Garlic is finely minced or pressed

3. 3

   Prepare capers and herbs

   • Drain the capers and pat them dry on a paper towel to remove excess brine.
   • This prevents the marinade from becoming too watery.
   • If using fresh parsley (optional), chop it finely into about 2 tablespoons (5 g).
   • Set aside.

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   Ready when: Capers are patted dry and parsley is chopped (if using)

4. 4

   Combine all marinade ingredients

   • In a small bowl, combine the lemon juice, lemon zest, minced garlic, drained capers, 1/2 cup (120 ml) extra virgin olive oil, 1 teaspoon (3 g) dried oregano, and 1/4 teaspoon (0.5 g) red pepper flakes if using.
   • Whisk together until well combined.
   • Taste and adjust the salt to your preference, remembering that the capers are already quite salty—add a pinch of kosher salt at a time.
   • Stir in the fresh parsley (if using).

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   Ready when: All ingredients are fully combined into a cohesive marinade with balanced seasoning

   Tip: Taste before adding extra salt, as the capers provide significant saltiness

5. 5

   Marinate the swordfish steaks

   • Place the 4 swordfish steaks in a shallow 9×13-inch (23×33 cm) baking dish or a large ziplock bag.
   • Pour the prepared marinade over the fish, turning the steaks to ensure both sides are coated evenly.
   • Cover the dish with plastic wrap or seal the bag, pressing out excess air.
   • Refrigerate for 30 minutes to 4 hours.
   • A 30–60 minute marinade is standard for fish, developing good flavor without affecting the delicate texture.
   • Longer marinating (up to 4 hours) deepens the Sicilian lemon-caper flavor profile.
   • Avoid marinating beyond 4 hours, as the citric acid can begin to affect the fish's texture.

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   Ready when: Marinade has infused into the fish with visible flavor penetration; fish is thoroughly chilled

   Tip: Don't exceed 4 hours of marinating or the acidity will begin to over-process the delicate fish texture. For thicker steaks, aim for at least 1 hour

6. 6

   Prepare fish for cookingOven 165°F / 75°C

   • About 10 minutes before you plan to cook the swordfish, remove it from the refrigerator.
   • Pat the fish steaks dry with paper towels to remove excess marinade.
   • This helps them develop a better crust when grilling or pan-searing.
   • If you'd like to reserve some marinade as a sauce for serving, set aside a portion that hasn't touched raw fish; alternatively, briefly heat any reserved marinade to 165°F (74°C) before serving to ensure food safety.

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   Ready when: Fish is at room temperature and the surface is dry

   Tip: Reserve a portion of unused marinade separately if you want to use it as a sauce later