Pulse the curry leaves, black pepper, and asafoetida once to make a coarse powder.
In a wide bowl add the rice flour, pottukadalai flour, peanuts, salt, butter, and hot oil.
Crush the peanuts and add, them if they are very big.
Add this to the bowl. Make this into a soft dough by adding little water. Make dough without adding cracks.
Keep it covered. Make it into a small lemon-sized ball.
Take one ball and keep it on a greased cover
Cover it with another greased cover or butter paper.
Press it with a flat vessel. This helps in even flattening. Alternatively, you can flatten it with your hands.
Prick it with a fork. Repeat this for the rest of the dough and dry this thaatis on a clean white cloth.
After making 10 thattais, you can even start frying.
Ensure they are not dried out, else they will break while taken out.
There should be some moisture.
Heat oil and when it is hot put the flattened thattais into the oil.
Fry in medium flame till the shhh sound subsides.
This thattais will not turn golden brown. So when the sound of the oil subsides take out the thattai. Drain in a kitchen towel.
Store this thattai in an airtight container. Crispy thattais are ready to eat with hot coffee or hot tea