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Bring a pan of salted water to the boil. Add the Brussels sprouts and cook for 4-5 mins until just tender, then drain and leave to cool a little before slicing in half vertically.
Meanwhile, heat 3 tbsp olive oil in a large frying pan over a medium heat, add the garlic and cook until golden but not burnt, around 4 mins. Use a slotted spoon to remove the garlic and discard. Add the chilli flakes and a big pinch of salt to the oil, then put the sprouts cut-side down in the pan, and leave them to cook for around 10 mins. Don’t be tempted to move them – this ensures that they get some colour. Add the remaining olive oil and the lemon juice, then cook for a few mins more.
Tip onto a large serving platter, top with lemon zest and season. These will hold in a low oven for 20 mins while you get everything else ready.