Wash the cabbage leaves under cold running water and let it dry. Chop cabbage and coriander leaves evenly.
Next, add lemon to the cabbage and coriander leaves. Put green chillies and ginger in a grinder and grind them to make a powder. On the other hand, place a fry pan over medium flame and put cumin powder into the pan. Roast cumin powder for 2 minutes till it turns light brown.
Now put cabbage leaves, yoghurt, roasted cumin powder, green chillies, ginger, sugar, coriander leaves, red chilli powder, black pepper and salt in a bowl. Mix them well.
Refrigerate the raita for 30 minutes an can garnish it with one or two coriander leaves. Serve chilled!