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Add salt and sugar. Puree the mixture in a blender until smooth. Return to the pan and keep warm.
Meanwhile, heat oil in a skillet over medium low heat. Fry bay leaves and red chillies until the chillies darken. Add kalonji seeds and fry for a few seconds. Fry the onion until richly browned but not burnt, 15 to 18 minutes, stirring constantly. Stir in green chilli. Pour this mixture over the pureed lentils. Simmer for 2-3 minutes.
Remove from heat. Stir in garam masala, lime juice and cilantro. Garnish with lemon wedges and serve.