Roasted Sardines with Caramelized Onion
Prep
20 mins
Cook
35 mins
Servings
4
Difficulty
Easy
Succulent fresh sardines paired with sweet caramelized onions, finished with crispy garlic and a splash of balsamic vinegar for an elegant yet simple Mediterranean-inspired dish.
Ella x
Ingredients
- 8fresh sardines(cleaned and gutted)
- 2 largeyellow onions(thinly sliced)
- 4garlic cloves(minced)
- 4 tablespoonsextra virgin olive oil
- 2 tablespoonsbalsamic vinegar
- 3 sprigsfresh thyme
- 1 teaspoonsea salt
- ½ teaspoonblack pepper
- 1lemon(sliced)
- ¼ teaspoonred pepper flakes
- 118 mlwhite wine
Detail level
Instructions
- 1
Preheat your oven to 400°F (200°C). While heating, pat the cleaned sardines dry with paper towels and season both inside and out with sea salt and black pepper.
Tip: Dry fish ensures better browning and prevents steaming during roasting.
- 2
Heat 2 tablespoons of olive oil in a large skillet over medium-low heat. Add the sliced onions and cook for 15-18 minutes, stirring occasionally, until they turn golden brown and caramelize.
Tip: Don't rush this step—slow caramelization develops deeper sweetness and flavor.
- 3
Add the minced garlic and red pepper flakes to the onions, stirring constantly for about 1 minute until fragrant. Pour in the white wine and balsamic vinegar, then simmer for 2 minutes to reduce slightly.
- 4
Transfer the caramelized onion mixture to a roasting pan, spreading it evenly across the bottom. Arrange the sardines on top, nestling them into the onions, and tuck lemon slices between them.
Tip: Arranging sardines on the onions helps keep them moist and infuses flavor.
- 5
Drizzle the remaining 2 tablespoons of olive oil over the sardines. Place fresh thyme sprigs on top and around the fish.
Tip: Fresh herbs add aromatic complexity to the dish.
- 6
Roast in the preheated oven for 12-15 minutes, until the sardines are cooked through and the skin begins to crisp slightly. The flesh should be opaque and flake easily with a fork.
Tip: Sardines cook quickly, so avoid overcooking to keep them moist and tender.
- 7
Remove from the oven and let rest for 2 minutes before serving. Taste and adjust seasoning with additional salt and pepper if needed.
- 8
Plate by dividing the caramelized onions among serving dishes and topping each with 2 sardines. Spoon the pan juices over everything and garnish with fresh thyme.
Tip: The pan juices are flavorful—don't discard them as they enhance every bite.
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