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Make the Mash: Boil the potatoes in salted water until tender (about 15 minutes). Drain well, then mash with butter and warm milk until smooth and creamy. Season with salt and pepper.
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Grill the Veggies: While the potatoes are boiling, brush the eggplant, zucchini, and bell pepper slices with olive oil. Grill on a hot grill pan or skillet for 3–4 minutes per side until tender and slightly charred.
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Heat the Mackerel: Open the pouch and gently warm the mackerel in its tomato sauce in a saucepan over low heat, or microwave it in a bowl.
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Plate Up: On each plate, place a generous scoop of mashed potatoes. Arrange the grilled vegetables alongside. Carefully place the warm mackerel and its rich tomato sauce next to the mash. Garnish with fresh herbs and serve with bread to enjoy every bit of the sauce.
