Soak Boondi in hot water for 5 - 6 minutes. Later, drain on a colander. Gently stir with a spoon and allow to cool completely.
Roughly chop the spring onion green stalks. Discard the spring onion bulb.
In a blender combine the mint leaves, green stalks, green chili, and 1 tablespoon thick curd. Make a smooth paste. Set aside until required.
Whisk curd till smooth and lump free, Use a wire whisk or hand mixer for the purpose.
Add spices, salt, sugar, and whisk again until smooth.
Next, add green paste to the masala curd. Whisk to evenly combine with the curd.
Add softened Boondi balls into the raita. Mix nicely. Keep raita in the refrigerator until ready to serve.
Garnish raita with boondi and chopped spring onion. Serve Boondi Raita chilled.