Wash chanadal for 2-3 times,Soak in water for 4-5 hrs.straib water,put Soaked dal in blender jar,add green chillies,salt,crushed garlic.Also add curd and some sweet sour water.(Make sweet sour water by mixing 3/4 tsp nimboo satv nimboo ka phool+ 3 tsp sugar+1/2 Cup water.stirr this mixture till sugar and nimboo satv dissolves.sweet sour water is ready)Blend it Coarsely to make the batter.cover and let it ferment for 4-5 hrs.Now add 2 tbsp sweet sour water, 1/4 tsp haldi powder and 2 tsp oil.