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Heat the grill and bring a pan of water to the boil. Drop the cauliflower into the water, then cook for 4-5 mins until just tender. Zest and juice half the lemon, then mix with the capers, parsley, mint, olive oil and garlic in a salad bowl. When the cauliflower is cooked, drain, then stir into the herby dressing with some seasoning while still hot.
Put the mackerel on a baking tray, zest the remaining lemon half over it, season, then grill for a couple of mins on each side. Cut the lemon into wedges. Serve alongside the mackerel and cauliflower salad.