firstly, in a large mixing bowl take 1 cup besan.
add in ¼ tsp turmeric, ¼ tsp ajwain and salt to taste.
additionally, 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.
finally, fold the besan chilla and serve with green chutney.