Whisk the curd first. Remove seeds from green chilly and chop it finely. Also, finely chop the mint leaves.
Preheat a pan. Place lotus seeds into it, stir constantly and roast until they slightly change in color. Within 2 to 3 minutes lotus seeds are ready. Add roasted cumin powder, black salt, plain salt, finely chopped green chilly, mint leaves, sugar and roasted lotus seeds in the curd. Mix all ingredients really well.
Within 15 to 20 minutes lotus seeds will soak the curd. Chilled lotus seeds raita is ready. Prepare for yourself and serve it as well.