In a mixing bowl, add 1 cup of batter.
Then add chopped onion, tomatoes, green chilli, ginger paste, red chilli flakes and ajwain.
Now in a pan, add oil, mustard seed, cumin seeds and some curry leaves. sauté and add tadka into batter.
Add baking soda and some lemon juice. Mix well.
In a pan, spread some oil and sprinkle some white sesame seeds on it.
Then add batter and spread it evenly.
Cover and cook
cover and simmer for 5-7 minutes or until the base gets cooked well.
now flip over and cook base for 3-4 minutes.
Enjoy besan suji chilla with tomato ketchup.