- take 1 cup besan. add in ¼ tsp turmeric, ¼ tsp ajwain and salt to taste, add ½ cup water or little more. mix with the help of whisk to form a smooth batter. now rest the batter for 30 minutes or more so that besan absorbs water and turn light. furthermore, add in ½ onion, ½ tomato, 2 tbsp coriander leaves, 1 inch ginger and 1 green chilli. mix well with the help of ladle and get to a flowing consistency batter. further, pour a ladleful of batter onto a hot tawa and spread gently. pour a tsp of oil over chilla. allow to cook on medium flame. now flip the chilla and cook both sides.