As a prerequisite dry Roast the Rice flour and Urad Dal flour till a nice aroma comes and allow it to cool down.
Soak Channa Dal in water for an hour before preparing/Powder Roasted Gram Dal into a fine powder using a food processor.
In a sieve, sieve together Rice flour, Urad Dal Flour, and Roasted Gram Dal flour together. This is to ensure the flour mix evenly.
To the flour add in the soaked Channa Dal, Torn Curry Leaves, Red Chilli powder, Hing, Salt, Butter and White Sesame seeds, Mix everything well with hand.
Next, add in the peanuts. By adding water mix the flour together to form a smooth dough. Make sure not more water is added.
Take a small portion of the dough and keep it in a zip lock cover and cover the dough with a zip lock bag and then press and flatten the dough as thin as possible.
Press with a fork to make impressions on the thattai. Heat oil for deep frying once it is hot fry the thattai , Cook evenly in both the sides and cook on medium flame, Once it turns crisp and golden brown remove from the flame and drain in paper towels.
Notes
Pressing the thattai very thinly gives a crispier thatti, the more you press the more thinner it will be.
This will comes by practice.
Any vessel’s backside can be used to press the thattai.
Few whole Roasted Gram Dal can also be added along with Peanuts.