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Marinate the onions: Thinly slice the onion. In a small bowl, mix the onion slices with a pinch of salt, sugar, coriander, and vinegar. Let the onions marinate for about 10 minutes to enhance their flavor.
Prepare the baking sheet: Place a large piece of parchment paper soaked in water on a baking sheet. Spread the seasoned potato slices evenly over the parchment paper.
Layer the vegetables: Spread the marinated onions and sliced sweet pepper evenly over the potatoes.
Add the mackerel: Place the seasoned mackerel on top of the vegetables. Dot the mackerel with small pieces of butter and sprinkle with dry parsley.
Cover and bake: Cover the entire dish with another piece of wet parchment paper to keep the fish moist. Bake in the preheated oven for 30 minutes.
Optional cheese topping: If you prefer a cheesy topping, grease a grater with vegetable oil and grate cheese over the top of the dish after the initial baking. Return to the oven and bake for an additional 10-15 minutes until the cheese is melted and golden.
Rest and serve: Remove the dish from the oven and let it rest for a few minutes before serving to allow the flavors to meld.
Prep Time: 20 minutes | Cooking Time: 45 minutes | Total Time: 1 hour 5 minutes
Kcal: 400 kcal (approx.) | Servings: 4 servings
TIPS AND SHARING IDEAS
Selecting Mackerel: Choose fresh or properly frozen mackerel for the best flavor. Fresh mackerel should have clear eyes and firm flesh. If using frozen, ensure it’s fully thawed before cooking.
Seasoning Variations: Feel free to experiment with different seasonings and herbs. Dill, thyme, and rosemary are excellent choices for enhancing the flavor of mackerel.
Potato Alternatives: You can substitute potatoes with sweet potatoes or a mix of root vegetables like carrots and parsnips for a different twist.
Vinegar Options: Apple cider vinegar or white wine vinegar can be used instead of regular vinegar for a slightly different tang.
Butter Substitute: For a dairy-free option, replace butter with olive oil or a plant-based margarine.
Garlic and Herb Butter: Mix the minced garlic with butter and herbs to create a garlic herb butter to place on top of the fish for an added flavor boost.
Adding Citrus: A squeeze of lemon or lime over the mackerel before serving can add a fresh, zesty note that complements the rich flavors.
Serving Suggestions: Serve the dish with a fresh green salad, steamed vegetables, or crusty bread to soak up the delicious juices.
Leftover Ideas: If you have leftovers, flake the mackerel and mix with the potatoes and onions to create a savory fish cake mixture. Shape into patties and pan-fry until golden and crispy.
Wine Pairing: Pair this dish with a crisp white wine like Sauvignon Blanc or a light red like Pinot Noir to complement the flavors.
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