Method: Roast cumin seeds (half tablespoon) in a pan, and then grind it into a fine powder. Keep a small amount of this powder aside for garnishing. Now, blend rest of the powder with creamy unsweetened yogurt (one and a half glass), crushed ice (one cup), grapes (one cup seedless), sugar (four tablespoons) and a pinch of salt. Serve the chilled lassi in glasses and garnish it with remaining cumin powder and finely chopped grapes.