Roasted Mackerel with Mushroom and Thyme
Prep
15 mins
Cook
25 mins
Servings
4
Difficulty
Easy
This is one of my favorite weeknight dinners because it comes together in just 40 minutes from start to table. Mackerel is wonderfully rich in omega 3 fatty acids, which are fantastic for heart health, and the earthy mushrooms paired with fresh thyme create such a lovely depth of flavor. The beauty of this recipe is its simplicity: you just roast everything together with a splash of white wine, and the fish cooks perfectly while infusing the mushrooms with its delicate taste. It feels elegant enough for guests but honestly couldn't be easier to pull off on a busy evening.
Ella x
Ingredients
- 4mackerel fillets(skin-on, about 150g each)
- 400 gmixed mushrooms(cremini, oyster, and shiitake, halved)
- 4garlic cloves(thinly sliced)
- 8 sprigsfresh thyme
- 4 tablespoonsolive oil(divided)
- 1 teaspoonsea salt
- ½ teaspoonblack pepper
- 1lemon(halved)
- 1shallot(thinly sliced)
- 100 mlwhite wine
- 20 gbutter
Detail level
Instructions
- 1
Preheat your oven to 200°C (400°F). Pat the mackerel fillets dry with paper towels and season both sides generously with sea salt and black pepper.
Tip: Drying the fish ensures the skin crisps beautifully when seared.
- 2
Heat 2 tablespoons of olive oil in a large oven-safe skillet over medium-high heat. Once hot, carefully place the mackerel skin-side down and sear for 3-4 minutes until the skin is golden and crispy. Transfer to a plate.
Tip: Don't move the fillets while cooking to achieve optimal crispness.
- 3
In the same skillet, add the remaining 2 tablespoons of olive oil. Sauté the shallot and sliced garlic for 1 minute until fragrant, stirring constantly to prevent burning.
Tip: Keep the heat at medium to avoid scorching the garlic.
- 4
Add the halved mushrooms to the skillet and cook for 4-5 minutes, stirring occasionally, until they start to release their moisture and begin to brown.
Tip: Allow mushrooms to develop color for deeper, earthier flavor.
- 5
Deglaze the skillet with white wine, scraping up any browned bits from the bottom. Let it simmer for 2 minutes until reduced by half.
Tip: The wine adds acidity and complexity to balance the richness of the mackerel.
- 6
Nestle the seared mackerel fillets skin-side up into the mushroom mixture. Scatter the thyme sprigs over the top and dot with butter. Transfer the skillet to the preheated oven.
Tip: Placing the fillets skin-side up keeps them moist during roasting.
- 7
Roast for 10-12 minutes until the mackerel is cooked through and flakes easily with a fork. The mushrooms should be fully tender and caramelized.
Tip: Mackerel is lean and cooks quickly; avoid overcooking to maintain moisture.
- 8
Remove from the oven and finish with a generous squeeze of fresh lemon juice over each fillet. Taste and adjust seasoning if needed before serving directly from the skillet.
Tip: Fresh lemon brightens the rich flavors and adds a final layer of freshness.
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