Add rice flour, salt, and red chilli powder to a wide mixing plate or bowl.
Add ajwain and sesame seeds too.
Combine all of them together well.
Whisk sour curd to make it thinner.
Add whisked curd to the above rice flour mixture.
Add little by little and mix it well.
Once the curd is mixed well with the rice flour, add water slowly.
While adding water gradually mix the rice flour and make a smooth dough.
Keep kneading while adding water.
Make smooth and pliable dough of it.
Knead the dough until there won't be any cracks.
Cover it with a damp cloth for 15 minutes.
We get different sizes and varieties of perforated plates to make janthikalu.
Fix one of them with the janthikalu maker. I prefer to use medium size holes plate.
Grease murukku mould with oil.
Knead a small portion of the dough and place it in the murukku mould.
Gently place the top spindle over it and screw it.
Using the lever on top of the murukku mould, press the dough to get murukku.
Heat enough oil for frying in a kadai.
Check the heat of the oil by dropping a small piece of the dough.
If the oil starts sizzling means oil is enough hot for frying murukku.
Slowly and carefully press the murukku into the hot oil.
If you are scared of the oil heat, you can always press murukku in a dry cloth or on a plate.
Then drop it in the hot oil using a spatula. Let the murukku cook on a low to medium flame.
Turn it and cook for another 2 to 3 minutes or until the desired colour is reached. Remove from heat and transfer the murukku onto a kitchen tissue.
Repeat the same way with rest of the dough.
Serve challa murukku with a hot cup of coffee or tea.