Vegetarian recipe ideas
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Mix together the cumin, coriander, cayenne and turmeric with the lemon juice and season really well. Make diagonal slashes in the skin of the mackerel and rub the spice mix all over. Leave for 20 minutes to marinate.
To make the salad, boil the potatoes for about 20 minutes until tender. Toss with the other ingredients while warm.
Grill the mackerel skin-side up for about 7 minutes until cooked through. Serve with the potato salad.