Cut cauliflower into 8 pieces with the stem. Prik the central stem with a fork. Put water in a wide saucepan, bring to boil add lemon juice and turmeric, cook the cauliflower until tender (uncovered), 5-7 minutes. drain and leave to cool.
Place yoghurt, oil lemon juice , garlic, ginger, chillie, salt, masala in a bowl, mix well. Add cauliflower, toss gently mix well. Marinade for 3 hours.
Grease the grill and cook it fro 6-8 minutes each side, turning from time to time. When finished sprinkle cummin powder and serve hot.