Whisk together curd, jeera powder and salt in a bowl until smooth and has a creamy consistency.
Add in 1 cup boondi, sugar, green chilli and coriander leaves and mix to combine. Refrigerate for 20-30 minutes. Adjust the consistency of the raita while serving - if its too thick, add a little water and mix.
Sprinkle with remaining boondi and a pinch of chilli powder just before serving. It tastes best when served cold.