Preheat oven to 180°C. Place yogurt, lemon grass, lemon juice, cream, green chilli paste, ginger-garlic paste, white pepper powder, salt and mace powder and mix well.
Add broccoli florets and mix well till the marinade coats the broccoli well. Set aside for twenty to twenty-five minutes.
Grease a baking tray and arrange the broccoli on it. Put the tray in the preheated oven and bake for fifteen to twenty minutes. Serve hot.