Heat the oven to 190°C/Gas 5. Season the cauliflower with salt and pepper and spread it out in a roasting tin. Roast in the oven for 12–15 minutes until lightly golden. Cover with foil if it’s browning too much.
Finish with a squeeze of lemon juice. Stir in the butter, cumin and lemon zest and roast for a further 3–5 minutes, until tender but so it still has bite. Remove the tin from the oven and stir in the parsley, then add the remaining lemon juice a little at a time to taste.
• For extra spiciness add 1 teaspoon of ground coriander and nigella (black onion) seeds with the cumin.
• Replace the cumin with dried or fresh thyme leaves.
• Swap the cumin for chopped garlic and chilli flakes (or chopped fresh chilli) and the parsley for fresh coriander leaves.