Roasted Swordfish with Caramelized Onions and Lemon
Prep
20 mins
Cook
35 mins
Servings
4
Difficulty
Medium
This swordfish recipe has become my go to dinner when I want something elegant yet simple. The beauty of it is that everything comes together in just 35 minutes, making it perfect for a weeknight meal without sacrificing flavor. I love how the caramelized onions become sweet and buttery, creating this wonderful contrast with the bright lemon and tender fish. Swordfish is packed with omega 3 fatty acids, which are great for your heart health, and the combination of garlic, thyme, and rosemary fills your kitchen with an aroma that feels almost restaurant quality. Best of all, you probably have most of these ingredients on hand already, so there's no fussy shopping list.
Ella x
Ingredients
- 4swordfish steaks(6 oz each, 1.5 inches thick)
- 3 largeyellow onions(thinly sliced)
- 4garlic cloves(minced)
- 4 tablespoonsextra virgin olive oil
- 2 sprigsfresh thyme
- 1 sprigfresh rosemary
- 1lemon(halved)
- 118 mldry white wine
- 59 mlvegetable broth
- 1 teaspoonsea salt
- ½ teaspoonblack pepper
- 1 tablespoonbalsamic vinegar
Detail level
Instructions
- 1
Heat 2 tablespoons of olive oil in a large skillet over medium heat. Add sliced onions and cook for 15-18 minutes, stirring occasionally, until deeply golden and caramelized. Season with a pinch of salt.
Tip: Don't rush the caramelization—low, steady heat brings out the onions' natural sweetness.
- 2
Once onions are caramelized, add minced garlic and cook for another minute until fragrant. Deglaze the pan with white wine, scraping up any browned bits. Stir in vegetable broth and balsamic vinegar. Simmer for 5 minutes, then set aside.
Tip: The wine adds depth of flavor and helps create a silky sauce.
- 3
Pat swordfish steaks dry with paper towels. Season both sides generously with sea salt and black pepper. Rub lightly with remaining 2 tablespoons of olive oil.
Tip: Dry fish ensures better browning and a crispier exterior.
- 4
Heat an oven-safe skillet over medium-high heat until very hot. Place swordfish steaks in the pan and sear for 4 minutes on the first side without moving them.
Tip: A good sear creates a flavorful crust while keeping the interior moist.
- 5
Flip the steaks and sear the other side for 3-4 minutes. Top each steak with sprigs of fresh thyme and rosemary.
Tip: The herbs will release their oils as the fish finishes cooking.
- 6
Transfer the skillet to a preheated 400°F oven and bake for 8-10 minutes, until the fish is opaque and flakes easily with a fork.
Tip: Don't overcook swordfish—it's best served slightly moist inside.
- 7
Remove from oven and spoon the caramelized onion mixture over each swordfish steak. Squeeze fresh lemon juice over the top and serve immediately.
Tip: The bright acidity of fresh lemon balances the richness of the fish and onions perfectly.
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