In a large bowl, mix together all the above mentioned ingredients (except oil to deep fry). Add water, little at a time, and knead into a dough.
Divide into small balls. Place each ball on a greased plastic sheet and cover with another greased sheet. Press it gently with the back of a small bowl into a thin disc and prick all over with a fork.
Heat oil in a pan. Gently remove the thattai from the plastic sheet and slide it into the hot oil.
Fry in batches on a low flame till all the sides are done. Drain on a kitchen towel and allow it to cool down before storing them in an airtight container.
Relish it as a tea time snack or when ever desired. I like to have mine with some hummus, mayo or any homemade dip. They taste great.