For the soup: Sweat the leeks and garlic in olive oil in a Marmite for 5 minutes. Add the cauliflower and sauté for a further 5 minutes before spooning over enough warm vegetable stock to just cover. Simmer for 40 minutes or until tender.
Remove from the heat and leave to cool. Blend with the cream in a food processor until smooth. Pour back into your cleaned casserole to warm through, then season to taste.
For the Parmesan cauli-florets: Preheat the oven to 200°C. Toss florets in olive oil, arrange baking paper on a baking tray, season, and roast for 25 minutes. Generously sprinkle with Parmesan and bake for a further 5 - 10 minutes until the cheese is caramelized and golden.
For the lemon-burnt butter, melt the butter in a small Le Creuset Saucepan over medium heat. Allow turning a rich golden brown, immediately remove from the heat and squeeze in lemon juice.
To serve: Drizzle the butter over the cauliflower soup, top with Parmesan cauli-florets, and garnish with nasturtiums and micro-greens to serve.
Nasturtiums are easy to grow and find - they grow like weeds and are edible. Just make sure to wash them properly. Alternatively, replace with watercress or sorrel.