Preheat the oven to 400°F / 200°C.
Cut the cauliflower into large chunks.
Whisk the miso paste, oil, water, ginger, salt and pepper in a large bowl to combine, then toss the cauliflower pieces in the dressing to coat.
Place the cauliflower pieces in a single layer on a baking tray and roast for 15 minutes, then flip each piece over. Roast for a further 10-15 minutes until soft, slightly dark and caramelised.
Serve warm topped with parsley and sesame seeds (if using).
