Cut away the outer leaves from the cauliflower, then trim back and remove the central stem, dividing the cauliflower into large florets as you do so. Thinly slice the florets about 2–3mm (1⁄16–⅛in) thick and place them in a large bowl. Drizzle over 2 tablespoons of the olive oil, pour over the lemon juice and scatter over the cumin seeds and mint leaves, then season well with salt and pepper. Use your hands to tumble everything together gently and set aside.
Set a large frying pan over a medium heat and add a dash of olive oil, followed by the pumpkin and sunflower seeds and a scattering of salt. Toast the seeds for 3–4 minutes, then remove them from the pan and set aside. Return the pan to the heat, add a further 2 tablespoons of olive oil and when the oil is hot, add the sliced onion. Season, then cook, stirring regularly, until the onion is soft and beginning to crisp around the edges (about 10–12 minutes). Remove the onions to a plate and keep warm. Return the pan to a high heat. Add the mutton loin and garlic to the pan. Season all over with salt and pepper. Cook for 5–7 minutes, turning regularly, until they’ve taken on some golden colour, then remove from the heat and allow to rest for 5–10 minutes in a warm place.
Scatter the cauliflower over four large plates or a serving platter. Slice the mutton into 1–2cm (½–¾in) slices and lay it over the top of the cauli. Scatter over the onions and the toasted seeds along with the preserved lemon skin. Drizzle with the honey, and dust with smoked paprika. Finish with a tangle of torn fennel tops, a lick more olive oil and some salt and ground black pepper.