Step 1 In a small, dry saute pan over low heat, toast the coriander and cumin seeds until fragrant, about 30 seconds. Grind in a spice grinder.
Step 2 In small bowl, combine the ground coriander and cumin seeds, yogurt, cucumber, garlic, shallot, mint, cilantro, cayenne pepper, lime zest and juice and salt and pepper to taste. Chill. (Makes 1 1/2 cups.)